The non-musicians

For those of us who did study music, one of the comical features of movieland is when someone who obviously knows nothing at all about music is cast as a conductor, pianist, etc. You would think the "conductor" could at least wave his baton in time to the music, even if it were not in the prescribed pattern, but some of them are not even close. And the pianists could at least move their hands to the right as the pitch goes higher and vice versa, but again, that is not a guarantee.