Best Friends Day is a yearly occasion of which appears in the episode "The Gift of Gum."
Best Friends Day is an occasion on which two best friends give each other a gift.
Role in episode
During this day, Patrick gives SpongeBob his large ball of gum of which is named "Gummy." At first, SpongeBob tries to convince himself that it is a fine gift because it is from Patrick, though he quickly changes his mind when the underwear manages to escape Gummy and crawls toward him and speaks. After this scenario, SpongeBob tries to get rid of Gummy several times, though Patrick keeps getting in the way as he gave this as a gift to SpongeBob and believes it should not be thrown away.