Strongman Jokes

Three people are stranded on a small island. One is a physicist, one is a circus strongman, and one is an economist. After a few days of surviving on fruit, they discover a cache of canned food, and they have to decide how to open it. The physicist says to the strongman "Why don't you climb that tree, and smash the cans down on the rocks, and burst them open?"

The strongman says, "No, that would spatter the stuff all over. I can open the cans with my teeth!"

The economist says "First, we must assume that we have a can opener."