Is there any good way to translate "what" when used as an ironic interjection, e.g. "What? He thought that would be a good idea?" said in a sarcastic tone? My first thought is just to use quis or quid but I don't know if that translates perfectly or if there's a better alternative.
First time posting here so apologies if I mess anything up. Also, sorry, I don't know if interjection is the correct term, but I don't know my grammatical terms very well and it seemed the closest to how "what" is used in this context. Thanks!