I met one of my best friends in Kindergarten, many, many years ago. We lost touch for a few years but reconnected in our 30s only to find that we had daughter's the same age with many of the same interests.
Another of my best friends I met at church. When a mutual friend introduced us with "She is so much like you", we looked at eachother and in stereo we said "Oh, NO!".... we were doomed to be besties from that moment on.