The Tonight Show host was in attendance for the Irish band’s July 22 show on their iNNOCENCE + eXPERIENCE Tour at New York City's iconic Madison Square Garden. Fallon -- in front row seats, no less -- held up a sign that said, "Singer with a broken finger."
Always the gentleman, Bono pulled Fallon on stage, and once the crowd realized who this mega-fan was, they went wild.
Fallon -- in true on-his-toes host fashion -- joked, "I'm afraid of Irish men that fall down and injure themselves." (Don't worry, that's not a mean dig -- just a very factual jab. Fallon was referencing Bono's biking incident last year that the two buddies spoofed on the Tonight Show after U2 had to cancel a week-long residency there.)
The 40-year-old comedian struggled to clap along with the band due to his hand injury, but that didn't hold the master impressionist back from taking on the U2 frontman. He played the harmonica, twisted his body into positions reminiscent of Bono's signature stage moves and dropped to the floor at the end of "Desire," all while Bono filmed Fallon on a cell phone.
Fallon wasn't the only Tonight Show member in attendance -- his resident band, The Roots, also took the stage, joining in for a rendition of U2's ode to New York City, "Angel of Harlem."
Was this a very well-planned publicity gag? Probably, but who are we to argue, especially since Fallon said it almost didn't happen:
Back in May, U2 took over the Tonight Show, so consider last night's amazing guest-spot a returned favor from the talk show host -- one that Fallon was pretty thrilled about himself. "I love you, U2," he wrote on Instagram. "I love you NY."
Bono is far from the first singer mega-fan Fallon has sung along with. He's dressed up like Tom Petty, Bruce Springsteen and David Bowie, all while singing along with them, but it's this impression of Neil Young that's truly too good to miss: