Ranma ½, part 11 number 9

Part 17: Death on Treasure Mountain: Mousse and Ryoga are fighting Lime and Mint. Ryoga is in serious trouble.

Part 18: The Tragedy of the Pail: Ryoga is nearly killed but gets so totally depressed that he unleashes an incredible shishi hokodan. This takes care of Ryoga's opponent. Ranma-chan then sees Ryoga and Mousse taking off with the pail of preservation. The two guys use the pail but it has the opposite effect on them, trapping them in their cursed forms.