We have a new favourite joke, thanks to Plus reader, Ellen Hetland Fenwick!
A countably infinite number of men went into a pub. The first one ordered a pint. The second ordered a half-pint. The third ordered a quarter of a pint ... The barkeeper, with a face full of disgust, finally poured two pints and put them on the bar and said, "It's good when people know their limit."
Ha(ha)n! And you can read more on beer and infinite series on Plus!