Batman's Parents.
Batman can go in a store without Robin.
They became flatman and ribbon. has left the building.
Batman: my parents Riddler: no its a bowling ball! I-im so sorry!
A bowling ball. Or Bruce Wayne's parents.
Fire in the hole!
By hiding the shovel in the shed/garage
Universal cereal bus
One who could read, one who could write, and the third to watch over those two dangerous intellectuals.
Jokes about Batman's parents can get old.