One Piece — "As of this moment, I quit the Big Mom Pirates!!!"

From Volume 86 - Chapter 863 / Season 13 Episode 833. During the disruption of Sanji and Pudding's wedding, Luffy is nearly immobilized by the vicious "Dogtooth" Katakuri. Jimbei uses water to help him escape the mochi trap, making it publically clear to every Big Mom Pirate present that his alliance is forfeit. In a situation where most traitors would fight or runaway, Jimbei instead makes a most formal farewell.