Charles A. Ridley: Lambeth Walk - #Nazi Style (1941)

This film short is called "Lambeth Walk - Nazi Style" and was made by Charles A. Ridley in 1941. He re-edited existing footage of Hitler and Nazi soldiers (taken from the propaganda film "Triumph of the Will") to make it appear they were marching and dancing to "The Lambeth Walk". He used the music because members of the Nazi party had called the tune "Jewish mischief and animalistic hopping". The re-edit was distributed uncredited to newsreel companies in the US and UK. Made 60+ years before YouTube, it is regarded as one of the first political remix videos. 

Geheime Reichssache - die Angeklagten des 20. Juli 1944 vor dem Volksgerichtshof