On a visit to Jimmy Fallon's show to promote the return of "Mad Men."
The real fun began when Jimmy challenged Jon to a game of war — but with a twist. At the end of each round, the winner got to douse the loser with a glass of water. The clip is very, very cute, thanks to Jimmy's incessant giggling and Jon's good sportsmanship.
One of the more entertaining late night skits I've seen in a long time.