U2 Secretly Performs in NYC Subway [Video]

Imagine being in the subway and seeing a free U2 concert. That's exactly what happened to some lucky strap-hangers this week.

Jimmy Fallon went undercover during a recent Tonight Show and took U2 with him. Dressed as street musicians, Bono and company were dressed in strange wigs and hats and started playing a low-key version of "I Still Haven't Found What I'm Looking For."

Finally, Fallon pulled off his disguise and introduced U2 to the shocked crowd. The band then launched into a rocking version of "Desire." You can check out the full video below.

What would you do if you saw U2 performing on a subway platform?