A drunk sitting at a bar observes a very snobby woman participating in a wine tasting contest.
She was very good at identifying the wine.
At the first taste she says: “Cabernet Sauvignon, 1998” and all the people were amazed.
At the 2nd try she answered “Cabernet Sauvignon, 1953” and they were once again amazed.
Then the drunk pisses in a glass and hands it to her.
She tries it and says “Yak, this tastes like piss!”
And the drunk says, “Yeah, but what year was I born?”
This joke is included in the Black Book of Jokes. You can order it from here.