Jumping Cups

Tying into our pirate theme we made these jumping cups today.  The thought was they would make great personal canons to fire at stacks of plastic cups.  But we found they had a mind of their own and we couldn't really aim them.  But they fly up wonderfully and are a blast to try and catch!

Jumping Cups
From:  Family Fun Magazine

Materials
2 plastic cups, same size
2 rubber bands
tape

Instructions
1. Make four evenly spaced, half-inch snips in the rim of one cup.
2. Cut two rubber bands, knot them, and place them in the slits so that they are just taut. Place a piece of tape over each slit on the inside of the cup to keep it from splitting.  Also place a piece of tape on the rim to keep the rubber band from slipping out.  (see picture below.)
3. To launch, press the rubber band cup down (at the edges) over the other cup.  Quickly let go and watch the cup blast off!