That is really funny.
The same sort of thing happened to mom a few years back. They had someone working in the crawlspace of their house, and the "hatch" to get in was in their fruit room. Well he left to go get something, and closed the door and turned off the light, but he left the hatch off. So she walked in to get something, and one leg went in the hole and one leg stayed up top. She broke her leg and just generally messed herself up pretty good.
That one wasn't so funny, but this one sure is.