Justin Bieber and Jimmy Fallon had an undercover dance-off in Central Park

On "The Tonight Show Starring Jimmy Fallon," celebrity photobombs have become a standard bit involving The Rock, Chris Pratt and Chris Evans, Cameron Diaz and more. But last night, Fallon and Justin Bieber threw on suits, wigs, and mustaches for a musical photobomb in central park. Set to Bieber’s hit “What Do You Mean?” the duo pranked unsuspecting walkers, pedicab drivers, and tourists with their antics. Eventually, they lost the goofy outfits, and people found out that sometimes two seemingly crazy people in New York City are something else entirely.