Gintama: Dai Hanseikai

アニメ銀ぎん魂たましー　大だい反省はんせい会かい

Some of the characters get together and talk about "regrets" they have after 4 years of anime Gintama. Soon they fight over who gets more screen time. Special animation shown at the Gintama Haru Matsuri 2010 live event.