Groan

Just came across one of the worse jokes ever, a real groaner. So I thought I share it with you and challenge you to come up with an even worse one:

One day, Rudolph the Red, the infamous Russian Tsar, is having his breakfast with his wife. When he looks outside he notices some precipitation, so he says to his wife: "Look dear, it is raining." His wife looks out of the window and replies: "I am sorry to disagree with you, but I think that is snow." A small domestic arises, so they decide to go outside and check, and what do you know, it turns out the tsar was right in the first place. Triumphantly he turns to his wife and says: "Now you know Rudolph the Red knows rain, dear."

(If you don't get it, try reading the last sentence out loud.)