MPH Tower remixed some Gilbert and Sullivan film footage (Pirates of Penzance?) with a rousing, Victorian-style cover of Sir Mix-A-Lot's "Baby Got Back" and the resulting video is pure hilarity. They editing is really tight, and the song is really well done.
(via Making Light)
Update: Jennifer sez, "The footage comes from the 1983 film version of 'Pirates of Penzance,' staring Linda Ronstadt and Kevin Kline. I am only mildly embarrassed that I know this. Heh."