Q: Levi, how the fuck can I get my brother to put the goddamn toilet seat down when he's finished taking a piss? It's so annoying, I'd like to use an non violent approach, but my patience is wearing thin...

Keep nagging him about it. As annoying as it would be, every time he doesn't put it down you annoy him over it until he eventually does start putting it down to avoid being annoyed.

Or you could chop off his dic-