Party Popper

Party Popper is a medal in Plants vs. Zombies: Battle for Neighborville. It is awarded for destroying three balloon bunches.

Origins
Its name is a pun of "party pooper," a person who throws gloom over social enjoyment, and "pop."

Description
So far, the town's balloons have remained neutral in the war between plants and zombies.

Which makes sense: they're just balloons.