I came across a video wizard recently known as StSanders. He takes music videos and creates a structurally similar song, then somehow modifies the video such that it looks like the original artist is singing his lyrics. Here's the Beatles. If you like it, Van Halen might be even better.
A medley of popular tunes played on PVC pipes
Why didn't I think of this. A blog called Things Organized Neatly which has things organized neatly.
Yeah, you're laughing now at the guys in these photos. Until I take a picture of you diving this summer.
There have been many Old Spice ad parodies. My favorite is Sesame Street's.