Some fruits can fling (throw) their seeds away when they are ripe. This is a type of rapid plant movement, where the fruit is thrown from a little "machine".

Pea pods often use mechanical dispersal. When the seeds are ready, the pod dries up. When the pod dries, the inside of the pod dries faster than the outside. This makes the pod twist inside, suddenly splitting open violently, rolling into a little spiral. When this roll happens, it makes the seeds fly out of the pod in all directions.

 If the ground is wet, the seeds can germinate right where they land; they can also stick to the creature that made the capsule burst open. This can help them be carried off to a new place.