Hmm, theres so many.....
Probably the worst was when a crane operator wasn't paying attention and yanked me up in the air with a roof truss (I was on the tag-line). Worst. Rope. Burn. Ever. Tore my leather gloves to shreds and I couldn't close my fists for a few days. Also got knocked off a roof (by a truss), had some pipe staging fall out from under me, got shot with a nail gun, and fell through a stair hole. Never broken a bone, and never been to a hospital.