A while back, when I was still pregnant, I was talking with a guy I crushed on for a while. He said, "Man you were so hot last year, I'm so glad we're finally talking."
My response, "..... Wait, last year?"
I usually end up being quiet in conversations people randomly start with me at work, making me look like an uninterested dick when really I just get caught off guard that someone is attempting to speak to me. People at my work are usually so busy we don't talk.