Image via WikipediaHere's one short and sweet example from an organic chemistry lab:
When I was in organic lab, my TA closed my heating reaction flask a little too tightly. It blew up. I pulled three pieces of glass out of my forehead right above my right eyebrow. The stopper hit my partner in the head. We lived long enough for the department to let us graduate.For educational and entertainment purposes only, please don't do any of these things yourself.
Yay for goggles!
Link from Boingboing:
Or does it explode?: Reddit collection of laboratory disaster stories - Boing Boing