Jokes / A can problem

A mathematician, physicist and economist after Titanic crash on uninhabited island in the middle of Atlantic ocean. Starving to death they found a can of roastbeef. They start debating how to open the can without can-opener.
Mathematician suggests to drop the can from the cliff to open it.
Physicist proposes to heat the can on bonfire.
Economist said:"Let's suppose the can is opened..."