Situation: Your neighbour claims when she went to a restaurant and ordered rabbit, the restaurant served her cat instead of rabbit. This seems incredible to you, so you ask her to repeat what she thinks they served her.

Interpretation of the utterance: Exclamative reiterative Wh-question with a nuance of surprise

Informator: E. B.

Utterance: Qu'es qu'es que t'an bailat?

Translation: What did they serve you?
[What-be(present, 3rd sing.) that-be(present, 3rd sing.) that you have(present, 3rd plur.) given?]