The line comes from Shrek, the 2001 DreamWorks animated film, during a campfire conversation between Shrek, voiced by Mike Myers, and Donkey, voiced by Eddie Murphy. Shrek uses the onion comparison to explain that ogres have layers and are more complex than people assume, while Donkey keeps misunderstanding him. The exchange became one of the film's most quoted moments and spread widely through memes, reaction videos and soundboards, where creators reuse it to introduce layered ideas, hidden traits or unexpected reveals.