A clip playing 'extremely' slow. If overused, it will/can be frustrating and old. Is used by some poopers today, and was even a fad in late 2007.
Mostly the video is entirely filled up with it. It's also useful to see odd frames which otherwise would be hard to spot. Even then, you can copy it and send it around the world. You can even take the FDS Startup,slow it down 25 times,and Squadalah! you have the Gamecube menu in 8-bit.