i got 2 methods first is explained in this video
theres a couple of things he leaves out like #1 u need to empty out the gunpowder from the poppers
and #2 of course u need to put the bbs in ion top but make sure u dont mix or it wont explode
second method u can do without an explosion ( its more humane but not as fun)
1. Obtain some cheap water balloons, and some cheap BBs.
2. Use a speed loader to load about 50 BBs into the balloon.
3. Push the BBs down to the bottom of the balloon when you have filled it.
4. Add another 50 BBs and do the same thing.
5. Blow the balloon up to the size of a human fist. Add about 10 mm of water.
6. This balloon will shatter on impact.