Dude you're a normal as the rest of us (which I don't know if that's a good thing or not). I think everyone's got a bit of a macabe side to them. It's more of curiosity than anything. I've seen the Zapruder film and I've seen JFK (actually I own it and have watched it quite a few times). I wouldn't start worrying until you want to act on those thoughts or the voices start getting louder (I'm fine now, the meds really quiet them down! haha).