Why Ketchup?

Ok ok...apparently the allusion is not obvious to everyone else. I was not a huge fan of Pulp Fiction but it was definately memorable. There are quotes from that movie that still rattle around in my brain and I only saw it once in the theater years ago.

"Three tomatoes are walking down the street- a poppa tomato, a momma tomato, and a little baby tomato. Baby tomato starts lagging behind. Poppa tomato gets angry, goes over to the baby tomato, and smooshes him... and says, Catch up."