Three friends, a mathematician, a physicist and an engineer, meet for dinner at a pizza place. The engineer arrives first and decides to order for everyone a 16″ stuffed crust pizza. The physicist arrives next and as the pizza is ready, states hating pizza crust and wishing to have as little as possible of that in his plate: but, he adds, I’ll pay 1/3 of the money, I want 1/3 of the area: that’s only fair. Right at this time the mathematician enters through the door. Discuss, in mathematical terms, the rest of the evening.

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Posted on the internet by Rebecca Truber on Yahoo! Answers. I don’t know the original source (please post it here, if you know it)
http://it.answers.yahoo.com/question/index?qid=20100726171905AAm0YYO