These two people are playing chess. The phone rings and one guy answers. His friend is on the other end.
After the greetings and a little chit chat, the friend asks "Whatcha doing?"
The player, deciding to have some fun with him, tries to come up with a joke. He looks down at the chess board and sees that he's in trouble from the other player's rooks. Then, he gets an idea.
He says, "I'm watching the two towers."
The friend replies, "Oh, you're watching Lord of the Rings?"
Jolly good Grobe!