Retail stories? Hoo boy.
So back in college I was working the counter at one of our campus's many convenience stores. I'd just finished restocking the shelves since nobody was there and mopping the floor. The store would close in literally two minutes.
Cue some very drunk guys fresh off a kegger run stumbling into the store. My manager is in the bathroom and I'm alone, annoyed that they're coming in so late. So they go to the milkshake machine and one of them gets a massive extra large milkshake (cake batter flavored, IIRC). His friends get bored and ditch him because I guess they realized this wasn't supposed to be a group activity. Well, the drunk dude trips over his shoelace, splatters the milkshake all over the wall, glass doors for the refrigerated section, and the newly mopped floor, and knocks over a shelf of chips. Then he stumble-runs away, getting up much faster than he fell down.
I'll give you two guesses for who had to clean it up.