In college I had a crush on one of my young professors and I wondered if there was any chance of her accepting a date offer. I never had the courage to ask her though. When she handed my final test results back to me there was a sticky note that said "I loved talking to you. If you ever want to talk about ANYTHING, give me a call", and her personal number was listed. I thought, "why would I want to talk about class now that I'm finished?" and I threw the note away and went on with my life. It wasn't until about 5 years later when I was randomly thinking about that moment when it clicked and I was like "damn it!".