You never know who you’re going to find on the other side of an elevator door.

“We’re about to surprise some people,” Fallon, 44, explained beforehand. “They’re going on a tour of 30 Rock. Theythinkthey’re going on a tour of 30 Rock. And they’re going to stop on the wrong floor, this floor. And that’s where we step in. You ready to do this?”

“Yeah,” Mrs. Obama, 54, enthused.

Jimmy Fallon and Michelle Obama.The Tonight Show Starring Jimmy Fallon/Youtube

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For their first bit, Fallon perused Mrs. Obama’s memoirBecoming, while she flipped through the host’s children’s book,Everything Is MAMA.

When the elevator doors opened, Fallon peeked out from behind the book. One woman muttered, “Oh my god.” Then the former first lady lowered her book, and the elevator riders screamed in surprise.

For his next trick, Fallon performed a bit of magic: He stood right in front of the elevator with a sheet, and when he lowered it, Mrs. Obama appeared.

Keeping the segment festive, Fallon played the piano and sang “Jingle Bells” as Mrs. Obama clapped along. One woman’s mouth dropped as she recognized the famous duo from their backs alone — and when Fallon turned to greet the tourists, the sightseers yelped.

For the following gag, Mrs. Obama hid in a massive gift box. As she popped out and struck a pose, Fallon told the crowd, “Happy Holidays.”

“Are you okay?” the tour guide asked the amazed fans.

Michelle Obama.The Tonight Show Starring Jimmy Fallon/Youtube

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As the elevator arrived again, Fallon casually jogged up and asked the astounded guests, “Hey guys! Mind if I get on?”

“Actually, you know what?” Fallon continued as Mrs. Obama came into view. “We’ll take the next one.”

One skit did not go as planned. As Mrs. Obama and Fallon performed a coordinated dance, the elevator opened with nobody onboard. “Oh well,” Mrs. Obama shrugged.

“Why don’t we just take the stairs?” the former first lady asked when Fallon started to get on the waiting elevator. “Why are you such a wimp?”

“I can walk back up if you want,” Fallon yelled from the elevator.

“Whatever,” Mrs. Obama concluded.

source: people.com