20. "Springtime for Hitler" from The Producers

That turning point where movie musicals finally learned that anything goes.

I'd be tempted to dock points from this for being a largely standard filming of a stage performance if the whole scene wasn't so damn influential.  Also catchy (is that bad), maverick, and entertaining.  Entertaining as hell.  A thousand numbers of musical comedy have come and gone and still this remains near the top of the heap, an ode to the offensive like cinema had never seen.

The Producers remains Mel Brooks' finest achievement, and this number is the moment you've all been waiting for.  The remake never really taps into the tawdry greatness of the original, but here's the only version that matters, perhaps the greatest comedy number of the movies.