The Gag Dollar is a gag toy that is featured in the episode "Pranks a Lot."
The Gag Dollar is similar to a regular Bikini Bottom Dollar, only it is fake and cannot buy one anything with them and are not counted as currency.
Role in the episode
The Gag Dollar is first seen after SpongeBob requests to Frank that he and Patrick want to buy something for only a dollar. Frank then holds out the Gag Dollar, saying that SpongeBob could fool his friends into thinking it is a real dollar.