[Shrek burps in front of Donkey and Fiona]
The Donkey: Shrek!
Shrek: What? It's a compliment. Better out than in, I always say.
The Donkey: But that's no way to behave in front of a princess.
[Fiona burps louder]
Princess Fiona: Thanks.
The Donkey: [to Shrek] She's as nasty as you are.