Am I Insane/Disturbed?

I love gorey cartoons like HTF and JTHM, but I wouldn't actually murder someone. However, sometimes I randomly will fiddle with sharp/dangerous objects (twirls knives, play with fire, etc.) I keep a calm complex, but sometimes I snap. On my last day in middle school, I was having daydreams of brutally murdering a bully. Please don't blame the cartoons, the daydreams actually occured more BEFORE I watched them. Sorry for the rant, I just want to know if these behaviors are normal.