Years ago I was a warehouse manager at a supermarket. One day I'm stood by the entrance to the shop floor having a chat with one of the guys who fills the shelves, and I see this little old woman trying to reach into the bottom of one of the freezers to get something, but she's so short there's no way she's going to manage it. I point her out to my mate, and we carry on chatting while watching her. She looks round and sees one of the stools the guys use when they're stocking up the top shelves. She goes and gets it, takes it back over to the freezer and climbs onto it. As we're watching her, she reaches into the freezer, looses her balance and falls in! All we can see is her little legs sticking out of the freezer and thrashing about as she tries to get back out. Two other shop floor workers see the legs and run over to help. We run out and up to the warehouse, by which time we are laughing so fucking hard that we're in tears.
Another time, I walked out of the pub and saw some guy carrying a big brown paper bag down the street, with what I assumed contained a takeaway of some sort. He's obviously having trouble with it, and I notice that the bottom of the bag is wet. Suddenly the bag splits, and containers full of sweet and sour sauce, pancake rolls, rice, and and a variety of other chinese dishes hits the pavement and explodes all over the place. I turned round and walked straight back into the pub in absolute hysterics, while outside the guy is yelling "FUCK SHIT CUNT PISSFLAPS ARSEHOLES" etc.