I suspect I've taken classes with over 50 professors, and only heard that once. And in that case she'd repeatedly asked the students to use her first name, and someone kept calling her "Mrs", and eventually she corrected the student: "Not Mrs. Either <firstname> or Dr. <lastname>".
Haha ... I've never been referred to as Doctor after the friendly "congrats Dr. X" when I finished my PhD. The funny thing is .. I only cared about it before I got my PhD. After that, it doesn't matter to me one bit.
Well .. it would be nice if I could put Dr. on my passport or drivers license. But that doesn't seem to be an option.
