Light’s biggest mistake in Death Note was not masturbating in front of L.
Light's biggest mistake in Death Note was not masturbating in front of L.
During that episode or two where L is monitoring the Yagami household, Light pulls out a "dirty" magazine (just chicks in swimsuits you'd see at the beach lol) and looks at it in front of the cameras so he doesn't appear too innocent. But that's it -- that's all he does. I forget whether L says this before or after that point, but L remarks that he's suspicious because Light appears "too innocent."
Light is a high school student at the time, and the fact that basically all of 'em do it is the worst kept secret in the world. In fact, if you don't masturbate, all that'll happen is that your body will pump it out while you're sleeping and you'll make a mess in your bed, so it's basically just a human need. He should've taken his meat AND BEAT IT! to convince L he wasn't aware that he was being watched.
And to be clear, yes I understand that this would require confirming that Light was 18 beforehand, lest the FBI raid all of our houses.