John Galecki + Mandy Patinkin — Dead Ringers?
Every actor has a dream of making it big in Hollywood when they get older. Like John Galecki, they might start off in a relatively unknown show that then develops a die-hard fan base and turns into one of the top-rated sitcoms on television, but then, almost overnight, these actors transform into iconic movie stars.
That's pretty much what happened to 'The Big Bang Theory' lead because his show is doing incredibly well and his beard makes him look like Mandy Patinkin.