New “Tonight Show” host Jimmy Fallon and “Mad Men” star Jon Hamm got into some rather hilarious shenanigans Monday (March 11) when they went to the Top of the Rock and photobombed unsuspecting tourists posing for pictures.

Hamm does a few by himself, which is funny, but the best ones are when Fallon and Hamm get in on it together — they chest bump, they piggyback, they jump in the air. It’s kind of amazing how well all the photos turn out.

Check out all the best celebrity photobombs in Zap2it’s gallery. “Mad Men” returns for the first half of its seventh and final season on Sunday, April 13.