In 2007, Steve Jobs announced the first iPhone. During the presentation, he introduced a feature called Multi-touch; he said,
"And boy, have we patented it!"
What I am wondering about is the reason why the subject "we", and the auxiliary "have" are inverted here. It doesn't seem to be an interrogative sentence to me, or is it a rhetorical question, by any chance? I have no idea of it. I would really appreciate it if you answer my question.