SHREK: ...ogres are like onions.
DONKEY: They stink?
SHREK: Yes. No!
DONKEY: Oh, they make you cry?
SHREK: No!
DONKEY: Oh, you leave them out in the sun, they get all brown and start sprouting little white hairs.
SHREK: No! Layers! Onions have layers. Ogres have layers. Onions have layers. You get it? We both have layers.
DONKEY: Oh... you both have layers... You know, not everybody like onions. Cakes! Everybody likes cakes. Cakes have layers.