Phrasal verb: catch up
Vincent: Sure, but I think I’m still a little too petrified to laugh.
Mia: Uh-huh. You won't laugh, because it’s not funny. But if you still wanna hear it, I’ll tell it.
Vincent: I can’t wait.
Mia: Okay. Three tomatoes are walking down the street, a poppa tomato, a momma tomato, and a little baby tomato. The baby tomato is lagging behind the poppa and momma tomato. The poppa tomato gets mad, goes over to the baby tomato and stamps on him -
(stamps the ground)
… and says: 'catch up.'
They both smile, but neither laughs.
Mia: See ya 'round, Vince.
Pulp Fiction. Quentin Tarantino. Faber and Faber. London-Boston. pag. 83