So your brother's kind of a weirdo. He's really into unwatchable experimental movies. He's got a dark sense of humor, but not in the socially acceptable "dark" sense of humor, but the real dark sense of humor that makes conversation stop and makes everyone look for the nearest exit.
You've become used to his weird quirks and are fairly certain he's not going to murder anyone anytime soon (at least you THINK so. I mean, even John Wayne Gacy had a sister), so for Easter, you've decided to give him something he'll like this year. Like a zombie-themed Easter basket featuring several of these Zombie Bunny Lollipops ($9, ThinkGeek). Your mother will be outraged, but your brother will be delighted. It's a good strategy. Keep the weirdos happy.