Bottom of the Cup

Now here is a great little challenge.

Tape two paper cups together with two ping-pong balls inside.
The way you tape them together is open end to open end.
Now challenge someone to get the balls each into a separate end of the cups.
It can be quite challenging.

What you do is spin the cups and the balls will fly apart into separate corners.

How I Would Use This

Well, first off I think it shows creative solutions. But I sense there are more ideas that I haven't thought of yet.

Here is how I go about figuring out how to use these ideas. I make a note of the main ideas I am dealing with. They are:

-separation
-togetherness (clinginess)
-shaking things up (spinning them around)
-counter-intuitive results

So, have at it. Can you think of anything that would connect to this simple and cool demo?