(I am working as a bartender at a restaurant. The waitress has added a 15% gratuity because the party has been large and difficult to deal with.)

Customer: “Miss? What’s this ‘gravity’ crap?! I ain’t paying for no ‘gravity!’”

Waitress: *without missing a beat* “Ma’am, that’s what holds the food to your plate.”

Customer: “Oh, alright then.” *pays the check*