well lol, I've only seen 4.5 years worth of stuff. Although my mom and my stepdad both worked for the same company for much much longer and they have some pretty good ones. They're too long and I don't remember the details enough to post here though.
Let me think. Once, I was working closing shift on self-checkout. Since self checkout is the only option after 11pm at my store, a lot of customers always get grumbly and mad. One night though, this lady in a Frisch's Big Boy (a restaurant) uniform was moaning about it at me, and I explained to her that the company schedules the other cashiers leave at 11pm. She cussed at me about it but I just walked away from her back to my post. This drunk dude using another register was like "you know, I wouldn't be complaining if you guys were out of onion rings" and she turned around and started screaming at him, and it devolved into a screaming match between both of them while I stood quietly hoping they'd shut up and finish their orders so they would leave. By the time I was about to go find the night-crew manager to tell them to quit, the drunk guy left. When the angry lady finished her order a minute later, I turned around and pleasantly said "thank you! have a nice night!" and she was mad like "ohh I will now!"
That's not really the best story I have but I don't have enough space here and I don't want to publicly discuss things my company might not want me to discuss lol.