Shrek: I told you, didn't I? You're not coming home with me. I live alone! My swamp! Me! Nobody else! Understand? Nobody! Especially useless, pathetic, annoying, talking donkeys! Donkey: But I thought... Shrek: Yeah. You know what? You thought wrong!
Shrek is upset after Fiona leaves with Lord Farquaad to get married and takes out his anger on Donkey.