I don't really believe in fate, but seriously this is exactly what I thought of when I saw this thread. Stuf like this happens to me far too often. It'll be as bizarre as seeing a cute girl randomly at the library, and then randomly bumping into her at a party and there's a spark. I think it's pretty crazy when stuff like this happens on such a regular basis to me in a school of 16,000 kids.
I remember when I was a sophomore in high school this freshman put posters up all over the school because she was running for class president and had pictures of herself on the poster. I thought she was really cute, but had never seen her before/had no idea who she was. The next year she ended up sitting at my table at lunch because of some far off mutual friendage. We ended up dating for about a year.
Like I said I don't believe in fate, but stuff like that makes me reconsider on occasion.