Imagine this: You're casually on a tour of 30 Rockefeller Plaza while visiting NYC. You take the lift with a kind NBC page as your tour guide. At a certain floor, the doors open unexpectedly. Who do you see? Um, how about Michelle Obama [1] and Jimmy Fallon [2] playing the piano. No, wait — they're dancing. Wait, nope — they're reading. They're . . . jump-roping? As part of her visit to The Tonight Show Starring Jimmy Fallon [3] on Dec. 18, the former first lady gave fans the surprise of a lifetime by popping out to say hello on their lift rides. Watch the full video above to see all the hilarious reactions. We really feel for anyone Jimmy said "We'll take the next one!" to.