A snow globe is an object that appears in the episode "New Leaf."
There are two different types of snow globes seen in the episode such as those that have a snowman inside and others that have a house inside.
Role in episode
Plankton sells a bunch of snow globes as part the grand opening of The Chumporium. SpongeBob even buys a snow globe for himself but Mr. Krabs suspects that Plankton is using the snow globes somehow to steal the Krabby Patty secret formula. Mr. Krabs then destroys most of the snow globes and an upset Plankton kicks Mr. Krabs out of his store.