I worked in restaurants throughout HS and college. A few of my stories:
I worked at a place on Lake Travis and would pick up shifts at others. It was a revolving door of employees moving from Iguana Grill to Oasis to Carlos and Charlies, to...servers in particular would go on a bender, get fired from one, then hired at another, and by the time they made it through the cycle the place they started at wouldn't remember them. When new busboys would start we'd send them over to one of the other restaurants at the beginning of the shift to get something that the other restaurant had supposedly borrowed. Typically like a chicken stretcher, glass magnet, left handed spatula. Things that, you know, didn't exist. They'd get to the restaurant that had borrowed it, and they'd inevitably tell the poor kid that a third place now had it. The new busboy would spend half an hour driving around the lake only to figure out that what they were supposed to go get didn't exist. It took some longer than others.
Similarly, we'd tell them that at dusk they're responsible for taking the US flag down. A few different people would mention it, then they'd be walking around the parking lot aimlessly looking for it (there isn't a U.S. flag) after sunset. When we could get managers involved, yelling and screaming about why a flag hadn't been taken down yet, it was a bonus.
Customers... Lots of just drunk assholes that have been mentioned by others. I've also been the recipient of the "Jesus loves you" tips more than a few times. There's something about the places on the lake, and how they serve margaritas in plastic tumblers that makes people think it's ok to just walk out with a 3/4 full margarita. It's a phenomenon I've never seen that much elsewhere, but more times than I could count I'd have to chase someone down in the parking lot and make them chug 6 ounces of margaritas before they took a cup with our phone number half full for a spin around lakeway. The look on their face was always this one of shock as though because they're within 400 yard of a body of water they should be allowed to just take alcohol past the signs that say "No alcohol beyond this point" and get in and take a drive.