Three Unfortunate People Are Shipwrecked

Three Unfortunate People Are Shipwrecked-a physicist, a chemist and an economist- and find themselves cast up on a desert island with little propect of finding food. A tin of baked beans is also washed up onto the shore, but the problem is how to open it? The physicist sets up a system of levers with stones and branches to exert pressure on the thin, but to no avail. The chemist tries a solution made from boiling a selection of barks and leaves, but that doesn't work either. The economist, who has been standing by all the time, smugly offers the solution: "Let's assume we have a tin-openner."