Watch Jimmy Fallon + Jon Hamm Photobomb Tourists - VIDEO

Jimmy Fallon and Jon Hamm decided to spend their spare time photobombing unsuspecting tourists and we think that's a totally legitimate way to spend a day.

The prank worked like this: The Tonight Show set up a camera on the top of their building (called Top of the Rock) and asked tourists if they wanted their picture taken.

Unbeknownst to them, Jimmy Fallon and Jon Hamm were behind them being generally hilarious sharing sandwiches, jumping around and making ridiculous faces.

Best souvenir photo ever or best souvenir photo ever? I think we all know the answer to that one.