Also the title of a music video by Otaku Vengeance. This video features Pikachu singing the Mindless Self Indulgence song (see AmadeusTheKitten's writeup) with the remainder of the cast of Pokemon providing backup.
This video is every bit as wrong as it sounds, but also every bit as hilarious. A must-see for any Pokemon fan -or hater for that matter- provided you keep it far away from the parents. It is a staple of most AMV collections, and is often used as an introductory vid for people new to the scene, since everybody knows (and almost everybody loathes) Pokemon.
As of this writing, the video can be found at http://www.otakuvengeance.com/mv/eric.shtml
If you're going to vote me down, that's fine, but could you at least /msg me with a note as to why when you do it? I'm honestly trying to make a decent writeup here.