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They can fly, they can fly, they can fly!

Before Peter Pan Live airs on NBC Dec. 4, Allison Williams stopped by The Tonight Show to give Jimmy Fallon a flying lesson. Describing the pro, "The coolest thing is the first time you go up into the air. I've watched a couple of people do it the first time and...everyone has the same expression on their face, which is just utter joy, and then a couple seconds later, pain. It's a harness. It's pretty uncomfortable," she said. "But I just love watching people take flight for the first time. Would you like to fly right now?"

Indeed he did! In fact, Fallon had his Peter Pan hat at the ready.

"I don't know if this is gonna be good," the host told his more experienced guest.

Williams then helped Fallon strap on his harness, politely instructing the comedian to turn away from the audience as he adjusted his manhood. "I think my bits are where my bits should be," Fallon joked.

"How's that feel?" the Girls star asked.

"Oh, just wonderful!" Fallon said in jest.

Jimmy Fallon, Allison Williams

Douglas Gorenstein/NBC

In order to fly, however, Williams reminded Fallon that he needed "to think wonderful, lovely thoughts." Once the host was up in the air, the actress challenged him to try a few tricks—like running and flipping.

Peter Pan Live airs Dec. 4 at 8 p.m. ET on NBC. It also stars Christopher Walken as Captain Hook.

(E! and NBC are both part of the NBCUniversal family.)

PHOTOS: Late-night talk show hosts