The magician displays an empty tuna fish can and fills it with water. He places a piece of paper over the open end of the can, and then turns the can upside down. Amazingly, the water remains suspended inside the can. “That’s science,” the magician says, explaining that a scientific principle makes the feat possible.
 
“This, on the other hand, is magic,” the magician continues, removing the card from the open end of the can. Amazingly, the water remains suspended in the can! When the can is turned upright, the water is poured out of it, and everything is as it began.