Ranma ½ (1989)

S1E150 The Dreaded Happo Mold-Burst

Happosai has long depended on his signature move, the Happo Dai-Karin or 'Happo Fire-Burst,' to achieve his desires. However, when the 'karin' aspect unexpectedly transforms into 'kaBIN,' he finds himself facing a rapidly deteriorating mold situation. As his trusty technique backfires, Happosai must navigate the chaos stemming from this unforeseen change, leading to hilarious mishaps and challenges he never anticipated.