Charlie Sheen and Jay Leno (Video)

Charlie Sheen was Jay Leno's guest on Thursday's Tonight Show.

Turns out Sheen didn't really believe he had tiger blood or Adonis DNA. He claims he was joking.

Who knew?

Here's video:

Jay surprised Charlie in his dressing room before his Tonight Show appearance.

Part 1: Charlie Sheen tells Jay Leno he was the reluctant conductor of a runaway train.

Part 2: Charlie Sheen tells Jay Leno he would have fired his ass too.

Part 3: Charlie Sheen on his relationships with his Dad and Brooke Mueller.