Ridiculous fake singing on film

[neutrino]

Where the singing is sooooo clearly not the actor's real voice and not even close to sounding like the actor. Here is Michael J. Fox singing Johnny B. Goode in Back to the Future (jump to 40 seconds when he starts singing):

Any other examples that are just so ridiculously fake? You can just mention it if you cannot find a video of it.

 

[superstar_88]

That's called acting. Should they have gotten a real time traveller to play the part.