Il est interdit d'interdire!
Il est interdit d'interdire! (pronounced [il ɛt‿ɛ̃tɛʁdi d ͜ ɛ̃tɛʁdiʁ], meaning "it is forbidden to forbid") is a French aphorism first used on an RTL broadcast by Jean Yanne in the form of a mocking joke.
Source: Wikipedia — Il est interdit d'interdire! (CC BY-SA 4.0)