My #bsdstart was on my second year in the university - out of a clear sky I've decided that I should know some *nix system. I don't remember why I chose FreeBSD, but I've obtained an extra antique PC somewhere and installed 4.7 on it.
As time passed, I've set up more and more services on it, and suddenly I felt familiar enough and pleased so much with the system that I've switched my main desktop to it from windows. Ever since, I use FreeBSD on all my computers.