1) A car traveling at twice the speedlimit jumps the curb while I'm walking down the sidewalk and collides with me in mid-air. (Okay, so this I'm certain of, the rest are just silly things that bother me for no reason.)
2) Brain tumor.
3) Chopped to bits by female serial killer or jealous ex-girlfriend.
4) Stabbed to death as a result of a skirmish with a stranger. (This one's pretty likely to happen too, and almost has a few times, but I'm pretty sure I'll be hit by a car before anybody ever gets around to stabbing me.)