Never Watch The Seventh Seal at Night

Really. It's very traumatic when, late at night with all the lights off, you nod off at the beginning only to momentarily wake up right when the screen cuts to a rotting dead face one of the characters has found. 

I'm not squeamish. I love CSI. There's just something about being unprepared to see it. And all the lights being off. Being fully awake helps too.