What can you be thinking of? What could you be thinking of? I can think of none, really.
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eipjoowhat are the difference in their meaning - or in nuance -, when we assume that both imply the narrator's annoyance?What can you be thinking of? What could you be thinking of?I can think of none, really. I suppose the 2nd has less faith in the listener's thinking anything at all, but that is too subtle for any native speaker, including me.