Is there someone around you who, if they ever turn out to be a serial killer, you'll say "I knew it!"?

You see people on the news interviewed about their neighbors who have just been arrested for beating kittens to death with dolphins, or collecting women’s stolen panties, or serial killing or whatnot, and the neighbors are always like, “He was such a nice man. Always sprayed down his sidewalk with bleach every week. Quiet. I never would have suspected!”

Well is there someone you know about whom you are going to say, “Oh yeah, HIM. I’m just glad he didn’t kill me, because I was pretty sure he was goign to kill someone,” when your local affiliate comes to call?

Doesn’t have to be murder, but is there someone you’re in contact with who looks pretty normal on the outside, but you’re pretty sure has a dangerous screw less somewhere in the transmission?