Infinitely many mathematicians walk into a bar. The first one says: "I'll have a pint of lager." The second one says: "I'll have half of what he's having." The

Infinitely many mathematicians walk into a bar. The first one says: "I'll have a pint of lager." The second one says: "I'll have half of what he's having." The third one says "I'll have half of what he's having," and so on. Then the bartender says: "You're all a bunch of assholes," and pours two pints.