It started as a post on r/rant by u/hitachi13 which gave legitimate reasons on why he seemed to hate sunfish specifically. Later it became known as the “Sunfish hate copypasta” and it gets reposted whenever fishes are mention.

So someone in a group asked me to tell them why I hate the ocean sunfish so much, and apparently it was ~too mean~ and was deleted. To perpetuate the truth and stand up for ethical journalism, I'm posting it here. [Rated NC-17 for language.]

Disclaimer, I care about marine life more than I care about anything else, for real. Except this big dumb idiot. And it's not like an ~ironic~ thing, I mean it IS hilarious to me and they ARE THE BIGGEST JOKE PLAYED ON EARTH but I seriously fucking hate them.

THE MOLA MOLA FISH (OR OCEAN SUNFISH)

They are the world's largest boney fish, weighing up to 5,000 pounds. And since they have very little girth, that just makes them these absolutely giant fucking dinner plates that God must have accidentally dropped while washing dishes one day and shrugged his shoulders at because no one could have imagined this would happen. AND WITH NO PURPOSE. EVERY POUND OF THAT IS A WASTED POUND AND EVERY FOOT OF IT (10 FT BY 14 FT) IS WASTED SPACE.

They are so completely useless that scientists even debate about how they move. They have little control other than some minor wiggling. Some say they must just push water out of their mouths for direction (?????). They COULD use their back fin EXCEPT GUESS WHAT IT DOESNT FUCKING GROW. It just continually folds in on itself, so the freaking cells are being made, this piece of floating garbage just doesn't put them where they need to fucking go.

So they don't have swim bladders. You know, the one thing that every fish has to make sure it doesn't just sink to the bottom of the ocean when they stop moving and can stay the right side up. This creature. That can barely move to begin with. Can never stop its continuous tour of idiocy across the ocean or it'll fucking sink. EXCEPT. EXCEPT. When they get stuck on top of the water! Which happens frequently! Because without the whole swim bladder thing, if the ocean pushes over THE THINNEST BUT LARGEST MOST TOPPLE-ABLE FISH ON THE PLANET, shit outta luck! There is no creature on this earth that needs a swim bladder more than this spit in the face of nature, AND YET. Some scientists have speculated that when they do that, they are absorbing energy from the sun because no one fucking knows how they manage to get any real energy to begin with. So they need the sun I guess. But good news, when they end up stuck like that, it gives birds a chance to land on their goddamn island of a body and eat the bugs and parasites out of its skin because it's basically a slowly migrating cesspool. Pros and cons.

"If they are so huge, they must at least be decent predators." No. No. The most dangerous thing about them is, as you may have guessed, their stupidity. They have caused the death of one person before. Because it jumped onto a boat. On a human. And in 2005 it decided to relive its mighty glory days and do it again, this time landing on a four-year-old boy. Luckily Byron sustained no injuries. Way to go, fish. Great job.

They mostly only eat jellyfish because of course they do, they could only eat something that has no brain and a possibility of drifting into their mouths I guess. Everything they do eat has almost zero nutritional value and because it's so stupidly fucking big, it has to eat a ton of the almost no nutritional value stuff to stay alive. Dumb. See that ridiculous open mouth? (This is actually why this is my favorite picture of one, and I have had it saved to my phone for three years) "Oh no! What could have happened! How could this be!" Do not let that expression fool you, they just don't have the goddamn ability to close their mouths because their teeth are fused together, and ya know what, it is good it floats around with such a clueless expression on its face, because it is in fact clueless as all fuck.

They do SOMETIMES get eaten though. BUT HARDLY. No animal truly uses them as a food source, but instead (which has lead us to said photo) will usually just maim the fuck out of them for kicks. Seals have been seen playing with their fins like frisbees. Probably the most useful thing to ever come from them.

"Wow, you raise some good points here, this fish truly is proof that God has abandoned us." Yes, thank you. "But if they're so bad at literally everything, why haven't they gone extinct." Great question.

BECAUSE THIS THING IS SO WORTHLESS IT DOESNT REALIZE IT SHOULD NOT EXIST. IT IS SO UNAWARE OF LITERALLY FUCKING EVERYTHING THAT IT DOESNT REALIZE THAT IT'S DOING MAYBE THE WORST FUCKING JOB OF BEING A FISH, OR DEBATABLY THE WORST JOB OF BEING A CLUSTER OF CELLS THAN ANY OTHER CLUSTER OF CELLS. SO WHAT DOES IT DO? IT LAYS THE MOST EGGS OUT OF EVERYTHING. Besides some bugs, there are some ants and stuff that'll lay more. IT WILL LAY 300 MILLION EGGS AT ONE TIME. 300,000,000. IT SURVIVES BECAUSE IT WOULD BE STATISTICALLY IMPROBABLE, DARE I SAY IMPOSSIBLE, THAT THERE WOULDNT BE AT LEAST ONE OF THOSE 300,000,000 (that is EACH time they lay eggs) LEFT SURVIVING AT THE END OF THE DAY.

And this concludes why I hate the fuck out of this complete failure of evolution, the Ocean Sunfish. If I ever see one, I will throw rocks at it.

Counter to the Sunfish hate copypasta

Zoologist here; the majority of this is so inaccurate the guy is basically angry at a figment of his own imagination, paha. I mean there's hyperbole, and then there's hyperbole. Yikes!

“They are so completely useless that scientists even debate about how they move. They have little control other than some minor wiggling. So they don’t have swim bladders. You know, the one thing that every fish has to make sure it doesn’t just sink to the bottom of the ocean when they stop moving and can stay the right side up. This creature. That can barely move to begin with. Can never stop its continuous tour of idiocy across the ocean or it’ll fucking sink.” 

Sunfish are, in fact, well understood and, though clumsy when idly basking, are reasonably accomplished swimmers when diving. They stroke their dorsal and anal fins laterally and in a synchronous manner to generate a lift-based thrust that enables 'em to cruise at speeds of 2-3mph (source), comparable to a whale shark and the perfect speed for suction feeding; ploughing straight into smacks of jellyfish and gobbling 'em all up.

Where they excel amongst fish is their ability to undergo substantial vertical movement in the water column. They possess large deposits of low-density, subcutaneous, gelatinous tissue which, unlike a swim bladder (which would otherwise change volume with hydrostatic pressure), is incompressible, enabling rapid depth changes and keeping them neutrally and stably buoyant independent of surrounding water pressure.

So, yeah, their unusual bodies are basically one big paddle, capable of putting some force behind their swimming to move over considerable distances, descending very deep, very fast.

“They mostly only eat jellyfish because of course they do, they could only eat something that has no brain and a possibility of drifting into their mouths I guess. Everything they do eat has almost zero nutritional value and because it’s so stupidly fucking big, it has to eat a ton of the almost no nutritional value stuff to stay alive.” 

Also incorrect. Jellyfish and other Cnidarians comprise only around 15% of their diet; they mostly eat young fish (including conger eelets) and crustaceans (pelagic crab, krill, copepods etc.), alongside squid, bivalves and other assorted zooplankton. They're generalist predators, not jellyfish specialists like sea turtles (source). They have a particularly rapid growth rate amongst bony fish, owing much to their unique genetics (source).

“Some scientists have speculated that when they do that, they are absorbing energy from the sun because no one fucking knows how they manage to get any real energy to begin with. So they need the sun I guess.” 

They spend the majority of their time actively hunting in the very cold deep (usually at ~200m, but up to 600m) and, being ectotherms, therefore regulate their temperature by basking in the sun, before pursuing another dive. Think of marine iguanas basking on hot rocks between nibble trips.

“And this concludes why I hate the fuck out of this complete failure of evolution, the Ocean Sunfish. If I ever see one, I will throw rocks at it.” 

Sunfish have been kicking about in temperate and tropical waters worldwide for around 50 million years and, until humans arrived on the scene, were overwhelmingly successful in their ecological niche. Sadly they're under threat by human activity and human activity alone - frequently caught as by-catch; having little commercial value, like sharks, their fins are cut off before they're dumped, often still alive, back into the sea to die.

If one is to start throwing rocks at terrible creatures, perhaps one should look at us humans first.