Russell Crowe's humble beginnings as an actor can be traced back to musical theater, he shared on 'The Tonight Show' (weeknights, 11:35PM ET on NBC). He nabbed his first film audition thanks to work experience in 'Blood Brothers.'

But the musical for which he's most (in)famous is 'The Rocky Horror Show.' The Aussie did 415 performances of the sci-fi/horror parody in New Zealand and Australia in the mid-'80s. Crowe played Eddie/Dr. Scott -- but performed as Dr. Frank-N-Furter (the "sweet transvestite" scientist) in the production's final 15 shows.

Of course, Jay Leno was well aware of this, and rolled some of the YouTube clip to prove it. Crowe is unrecognizable.