From the Super Mario Wiki
Glad Parabombs are enemies that appear in Super Princess Peach, and can be found in Fury Volcano, Wavy Beach and Giddy Sky. They are happy variants of regular Parabombs that float down to the ground with parachutes, becoming Glad Bob-ombs once they land or the parachute is removed.
According to the game's Glossary, "It gets happy when it loses its parachute. Then it skips."
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