[Long] A mathematician and his infinite amount of friends walk into a bar.

The bartender asks "what will you all be having?" The mathematician then says, "I'll have a beer and my friend will have half a beer, my other friend will have a quarter of a beer. My other friend will have an eighth of a beer, then a sixteenth," etc. This goes on for a while and after about 40 or more orders, the bartender pipes up, "Jeez, you mathematicians sure don't know your limits," and places two beers down on the counter.