The customer is always right... and their jokes are always awful.
In addition to doing their jobs, servers, bartenders, cashiers, and other workers have to endure being the audience for customers who like to do bits. Many patrons will be disappointed to learn that they're not the only one who jokingly says "hated it!" when they hand back an empty plate, and that all the jokes have been told before.
Service industry workers shared the worst jokes they frequently hear from customers, and it's time to retire these from the repertoire.
I work at a restaurant where it is required grate cheese onto your dish (lol euphemisms) if you're so inclined. It's common practice to be a doucher/douchebaguette and say, "Don't stop until your arm gets tired!" and things of that effect. Every table. Every time.
I will grate your face, motherf*cker, and THEN WILL I STOP WHEN MY ARM TIRES. -unclewalty