These fan videos include sampling clips from movies or television shows, creating movies within video games, using flash animation (or stop motion animation, claymation, etc.), roping friends and family into participating in a live-action video, and so on, all set to a favourite song or used
It isn't exactly like they are talking about, but this reminds me of when my Spanish teacher allowed us to create music videos and songs based on the topic we were learning about in class.