Tonight was the last lecture of the semester, and toward the end of class I saw a couple kissing in the back corner of the lecture hall (80 students, 200 seats). He was one of my students, she was not, so that can mean only one thing... my lectures are so good that people bring dates! I feel so affirmed.
After calling attention to them, and thanking them for the affirmation, their reaction varied considerably. The guy looked happy and was looking around. The women buried herself in a book and didn't look up again till the end of class.
Teaching can be pretty funny sometimes.