A kid goes into a restaurant without parents, and a waitress came up and said, "You have to leave; this is a family restaurant."
Family Restaurant
Explanation
Explain Bear
Listen up, buttercup. The joke is that the kid is an orphan. The waitress tells the kid to leave the restaurant because it's a "family restaurant," implying orphans ain't got no families, which ain't very nice. You probably think mayonnaise is spicy, don't you?
Berbolate
Where’s the waitress’ family?