U2 popped up unexpectedly yesterday in just about the last place you'd expect to find them, the New York City Subway system.

The band's performance of 'Angel of Harlem' down below, is part of their upcoming appearance with Jimmy Fallon which will air Friday. Bono was seen earlier this week with Jimmy, reportedly re-creating his infamous bike accident.

Approximately six months ago, Bono fell off his bike in Central Park and seriously injured his shoulder, hand and arm. The injury led to a cancellation on the Tonight Show.