This was one of our science experiments we did recently.
We filled a pot of really cold water.
We put about 2T of water in the bottom of an empty soda can.
We put it on a burner until we could hear the water boiling and see steam rising from the can.
We very carefully picked up the can and quickly put it into the pot of cold water.
And it instantly imploded!
We had to do it three more times just for fun!!