Cydia deshaisiana (Lepidoptera: Tortricidae)
UC Berkeley campus, Berkeley, Alameda County, California
November 23, 2007

These are seeds of a shrub in the genus Sebastiania. Each has a moth larva inside it that moves or jumps under certain conditions, causing the whole seed to jump; the seeds are known as Mexican jumping beans. See these photos of a cut open seed in which you can see the larva.