What you will need to make a cherry bomb: 
1. Gun Powder 
2. A ping pong ball 
3. Cannon Fuse - the stuff found on good rockets. Approximately 3+ inches. 
4. Needle, something thin and sharp 
5. Nail Polish *OR* 6. Tape- Any kind of strong tape. 
Instructions: Get the ping bong ball and poke a hole in it with the 
pin. Now, place as much gun powder in the ping pong ball as possible 
and then put the fuse through the hole. Place it in a safe place 
and light the fuse, then run. 
Options: Cover the entire ball with nail polish and/or tape. This 
will give it an extra bang. Remember: This bomb is very flammable 
because after the explosion the ping pong ball will consume itself 
in flame. Recommended uses: Waking someone up. Dropping in a 
gas tank - very large expolsion. Maybe a few iron bits in the ball 
- good shrapnel.