Situation: At two o'clock in the morning, you are asleep in your bed, and you hear someone knocking at the door. Ask yourself who the hell it could be at that early hour.

Interpretation of the utterance: Exclamative Wh-question

Informator: L. T.

Utterance: Qual sap qual es aquò que tusta a la pòrta?

Translation: Who knows who is knocking at the door?
[Who knows who is that that knocks at the door?]