You wanna know what creeps me out. The fact that some people have very literally spontaneously combusted. With no trace of fire anywhere but the part of their body (or whole body) that was burnt. I personally think there are enough things to be freaked out about, now when I remember this phenomena, I have to worry about possibly bursting in flames for no reason.
Relevant - Spontaneous Human Combustion
Edited: for linkz :)