Tourists on top of 30 Rockefeller Plaza in New York City in 2014 thought that they were getting their photos taken for the building’s website.

WATCHGeorge Clooney And Julia Roberts on Carpool Karaoke w/ Gwen Stefani

Little did they know that Golden Globe winning actor Jon Hamm and The Tonight Show host Jimmy Fallon were making side-splitting guest appearances behind their backs.

(WATCH the hilarious montage above)

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