It would be morally wrong of me to write a list of themes from childhood and not include this one. It's just so much fun to sing. The show is a (particularly brilliant) fighting anime, following Kid Muscle as he tries to win various wrestling tournaments. The theme describes this, telling us who Kid Muscle is, and all about the Intergalactic Wrestling Federation (IWF), that the games are a part of. The theme reflects the tone of the show in that it describes some pretty serious back story, but isn't afraid to throw in a fart joke. And it's a testament to the writers that they managed to get so much of the back story across, and make it funny, and make it a damn good listen.