I was a bartender for a bit.
It's normal for coworkers to complain about picky/annoying guests.
A coworker came up to me:
Jfc guy said he wanted a lot of lemon with his Pepsi, I gave him 3, he said he wants like a whole lemon worth of slices wtf
Me: Was he... Old?
Yeah...?
Me: kidney stones. That mans probably had a few, and he's done with em. Give him a sidecar of fresh lemon juice (something we had on hand), you'll make his day.