Jimmy Fallon and Jon Hamm Photobomb Tourists

'Tonight Show' host and 'Mad Men' star high-five, chest bump and chow down on a hoagie on top of Rockefeller Center

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Goofy bros photobombing your family's vacation pictures are never fun – unless those two bros are Jimmy Fallon and Jon Hamm. On Monday, the Tonight Show host and Mad Men star took to the top of Rockefeller Center where they inaugurated the Tonight Show's "Celebrity Photobomb" segment, "ruining" photos visitors were told would appear on NBC's Top of the Rock website ("We were lying," cracked Fallon).

Fallon and Hamm started small with run-of-the-mill goofy faces, but soon upped the ante with chest-bumps, high-fives and piggy back rides, all without attracting the attention of the unsuspecting tourists. The pair even popped out of a chimney-like box and chowed down on a giant hoagie, Lady and the Tramp-style.

Check out the 6 best musical moments from Jimmy Fallon's 'Tonight Show' debut

Fallon has been on a roll since taking over the Tonight Show from Jay Leno: He's already welcomed U2 and Arcade Fire to the stage, spoofed the 50th anniversary of the Beatles' appearance on The Ed Sullivan Show and unleashed the fifth installment of his "History of Rap" franchise with Justin Timberlake.

As for Hamm, the actor is gearing up for the the final season of Mad Men (like Breaking Bad, the show's last season will be split into two seven-episode halves). New episodes don't start until Sunday, April 13th at 10 p.m. EST, but you can take a sneak peak at the upcoming season in our recent photo gallery, and check out an exhilarating new promo in which Don Draper disembarking from a plane.