Dear all of us, did you ever have the wrong impression of someone?

Did you ever have feelings about someone then to find out that those feelings were so very wrong?
It happened to me today. I had feelings(not great ones) about someone. Then I sat down and listened, really listened. It turns out that I was really off base. I'm glad that I was off base but I was really, really off base.
I am so glad that I met with this person today....
I am even going to send her a note of thanks for meeting with me.
Has this ever happened to you?
How could I have been so wrong?