Play it again Sam...

...which, by the way is one of those false quotes - it was never said.  But, fascinating fact - watch the film (Casablanca) and you will never see Dooley Wilson's (Sam's) fingers on the keyboard - why?  Because Wilson couldn't play!  This most iconic scene was faked - the piano playing was all done off-screen by one Elliot Carpenter.  Does this in any way devalue the film?  No way!!