In the latest episode of the sitcom The Big Bang Theory, there was this joke:
I’ve got a lab full of alcoholic monkeys and tomorrow is the day we switch ‘em to O’Doul’s.
I can't really understand the joke, because I don't know what or who O'Doul is. I tried googling, but all I got was a baseball player named Lefty O'Doul, which doesn't help me in understanding the joke.