I thought of this question because someone joked about double-dipping their hands in the chocolate fountain at Golden Corral and boy did that invoke one of my least favorite paying-for-college memories.
Yes, someone did dip his hands into the chocolate fountain at the Golden Corral. Worse, he was a repeat offender, a man that was at least in his 30s if not older slurping it off of his fingers and all, sometimes while making eye contact with me or my coworkers. Worse, there was no enforced rule against doing so, at least at my location, so my manager just told me to let him do it, don't make a big deal out of it, and hope he doesn't bother anyone else.
That same manager once insisted on me making the place extra clean a little before Christmas, so they insisted that I use double the amount of cleaning bleach in the same bucket. I explained that's not how cleaning works or how OSHA compliance works. I got a write-up. I said that wasn't an offense that qualified for a write-up, and what they said was "thanks for the tip, I'll find something that is. Your word against mine." 
That same manager punched me out early without telling me, because the place wasn't perfect enough before I left over an hour late, missing my family waiting to pick me up outside by that long to go out to do holiday stuff. I did call that in on the supposedly anonymous tip line later, but you can guess what happens when an anonymous tip about wage theft is called in on a manager that already knows who would call in that tip in a "right to work" situation. 
That same manager was fired a week later for embezzlement, and not the cool kind. They were writing up and firing people for months for money missing from the register. I found out when collecting my last check and noticed someone new. 
I have so many. I could talk about the time when I worked in ice cream. We had a dollar cone day, all cones (regular sugar and cup) were a dollar. Waffle cones were still like 4.50 because bigger cone more ice cream. Almost everyone understands this but I explained it anyway to every single person that came up to the window all day. So I'm like 6 hours in with no break at this point (I was clocked out for my break but told to keep working anyway). Some lady comes in with her family of 6 and orders 6 waffle cones. I start explaining and she snaps at me 'I know I know go do your job." Okay. 6 waffle cones out that window and that total is like 30 bucks or whatever. She hands me 6 . I try to explain again and she says it's 6. So her response is to cuss me out, a 17 year old. And then throw her ice cream in my face. My manager did not let me go clean myself up, wrote me up for being rude to the customer, and then took the bill that lady just ran out on out of my paycheck for the day. Which was probably most of it because I was only making minimum wage back in the early 2000s.
My last day at that place I left an hour early, without doing any of the clean up tasks, with 6 pints of ice cream, some cones, and some scoops, to go to a party. I did not pay. I still have one of those scoops too real nice scoop.
I started that job a Rules Matter Republican and ended that job jokerified and fully believing that society was beyond repair and that it was specifically western governments fault for it. It wasn't until like a decade later that I unlearned the rest of it through a host of other radicalization moments and realized oh huh I'm communist. But that was one of the first.
The manager absolutely saw him and the customer as the same class and you were a slave that embarrassed him wtf
They totally fucking do this it's wild
jfc, i had a grocery store job for my first job that was mostly annoying but nothing really like that. i was also completely uninterested in doing the shitty job and would just walk around and eat cookies in the backroom.