Here’s a joke from my coworker Ed:
An infinite number of mathematicians walk into a bar.
One of them approaches the bartender. The bartender asks, “What’ll you have?”
“A beer,” the mathematician says.
“And for you?” the bartender asks the next mathematician.
“Half a beer.”
The bartender pauses, then moves on. “How about you?” he asks the third mathematician.
“A quarter of a beer.”
The bartender stops. “You’re all idiots,” he says. Then he pours two beers and walks away.