55. Losing your head to a windowpane flying off of a flatbed truck
As Seen In: The Omen (1976)
Director Richard Donner's intelligent horror picture The Omen has rightfully earned a reputation as an elegant, mood-over-gore exercise. Which isn't to say that it's without any truly savage scenes, though. Just watch what happens to secondary protagonist Keith Jennings (David Warner) when he bends down to tie his shoes in an alley in Israel.
Thanks to Damien's (Harvey Spencer Stephens) birth, demonic forces have been causing murders and suicides, and it's precisely that kind of unseen presence that compels a flatbed truck to speed through the alley in reverse, which sends a lengthy sheet of glass flying through the air to sever Keith's head from his shoulders.