- a balloon
- a plastic cup
- Blow up a balloon until it is only about as big as a grapefruit, or a softball.
- Hold the rim of a plastic cup against the side of a balloon. The balloon should not fit inside the cup.
- Keep holding the cup in place, then continue to inflate the balloon.
- Let go of the cup, and pinch off the balloon. The cup sticks to the balloon!
How many cups can you stick on your balloon at once?