This has nothing to do with wine so you can stop reading now if not interested. I know there are a few here who appreciate a brain teaser, so here is one that I was looking at this afternoon. I cannot take credit for it… it has its own Wikipedia entry under ‘Cheryl’s birthday’. Enjoy!
"Albert and Bernard just become (sic) friends with Cheryl, and they want to know when her birthday is. Cheryl gives them a list of 10 possible dates:
Cheryl then tells Albert and Bernard separately the month and the day of her birthday respectively.
Albert: I don’t know when Cheryl’s birthday is, but I know that Bernard doesn’t know too. (sic)
Bernard: At first I don’t (sic) know when Cheryl’s birthday is, but I know now.
Albert: Then I also know when Cheryl’s birthday is.
So when is Cheryl’s birthday?"