An infinite number of mathematicians walk into a bar. The first one orders 1 beer.
The second one orders 1/2 of a beer. The next one orders 1/4 of a beer. After that, one orders 1/8 of a beer. The next one orders 1/16 of a beer, then 1/32 of a beer, then 1/64 of a beer, and so on for a few minutes.
The bartender says "you're all morons" and pours 2 beers.