Ranma ½, Part 3 number 2

A trap has been set to exploit Ranma's fear of cats but things don't go exactly as planned. For one, Akane gets trapped with him. The other: Ranma, when totally terrified of cats, reverts to being a cat himself.

His level of violence is so high that it even terrifies a tiger who is in the room with Ranma and loads and loads of cats. Ranma is able to defeat virtually anyone or anything that gets in his way except for catnip.

Akane shoots catnip at Ranma and Ranma calms down, settling into Akane's lap like a cat. He even kisses her.