[Loser]

A physicist a biologist and a mathematician were at a bar, drinking and looking out the window. As they watched a building across the street, they saw one person walk in and two people walk out.

"Reproduction by fission!" the biologist claimed.

"No, no. This does not fit our well tested and published theories," countered the physicist, "we must not have all the data."

While these two were arguing, the mathematician watched another person walk into the building. "It's settled then," he said to his two friends, "there is no reason for argument: that building is empty."