Dragon Ball Kai (2014) - episode 30 - 01 Nov, 2014

Without Babidi to order him around, Buu continues to freely destroy cities while waiting for his opponents. With less than thirty minutes left on Earth due to the energy spent in Super Saiyan 3, Goku wastes no time teaching Goten and Trunks the key to the Fusion technique, the somewhat embarrassing-looking Fusion Dance. (Source: Wikipedia)