A female student once handed me a note that said, "I want to f--k you." She would have been 18, I was in my late 20s. It was entirely unexpected, not sure we'd ever spoken outside a classroom. Was her behaviour:
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Hmm, that removes the student/lecturer issue... but why not just ask you for a coffee or beer?
I have absolutely no idea! At the time, I thought there was a non-trivial chance it was some sort of dare between friends - i.e., not serious. But I was leaving, so... I didn't really think much about it.