One of my colleagues put a wine bottle into a shoe, so the base of the bottle was resting where your heel would go.
Then repeatedly 'tapped' the bottle/shoe combination heel first against the wall. Apparently hoping the hydraulic rebound would cause the cork to back out.
The bottle smashed. The concrete wall was permanently stained, the shoe was ruined and the carpet needed to be cleaned.
Very entertaining, but not terribly useful.