10 Actors Who Needed Doubles For Ridiculous Reasons

8. Jack Black Couldn't Play The Electric Guitar Properly - School Of Rock

As an immensely talented actor-musician, Jack Black seemed like a note-perfect choice for the role of guitar-shredding teacher Dewey Finn in School of Rock, but there was one minor, unexpected complication.

Though Black has proven through his work in Tenacious D that he can rock an acoustic guitar with the best of them, at the time of the movie's filming he rarely dabbled with the electric guitar, and therefore had to actually learn how to play the instrument to a basic level.

However, Black only performs a small amount of the playing himself, and for the solos, a double was drafted in to play. Given it's no secret that Kyle Gass is the more accomplished guitar player in Tenacious D, it actually makes a ton of sense.

Granted, it's reasonable to assume that Black would know enough about music to probably fake the solo to a decent standard (or have director Richard Linklater shoot around it), but apparently that wasn't the case.