Good ol' Scopitone - I think this is my favourite. It's like reverse charades - one person sings a song and the others have to interpret each lyric visually and as literally as possible.
This example is even more literal than that Dylan musical from a year or two ago ("The Times They Are A-Changin'") in which, during "Like a Rolling Stone", they were to be seen rolling things that looked like stones around the stage.

Great clip. And talking of too-literal interpretive dance moves, what about Pan's People? All that finger wagging and heart clasping.