I met my best friend when I was a freshman in high school, on the first day, during first period. I was picking up some papers and heard my own voice behind me. As it turns out, we had about the same voice and it's only gotten worse over the years. So that's how we started talking to each other and why folks think we're brothers.
About six years after meeting him, I was telling a group of mutual friends about this one time I played an online text based game with some random person, and he chimed in to finish the story - as it turns out, we met online about two years before his family moved to my town and we met in person.