Float a water-soaked Ping-Pong ball in a can of water held more than a meter above a rigid floor. Then drop the can. Careful inspection will show that the ball was pulled beneath the surface as both the ball and the can drop. (What does this say about surface tension?) More dramatically, when the can makes impact with the floor, what happens to the ball, and why? Try it and you'll be astonished! (Caution: Unless you're wearing safety goggles, keep your head away from above the can when it makes impact.)