Really just a combination of a bunch of random things and inclinations. '99 was definitely the launching point, but mainly because my parents let me out of bed to watch the end. '03 I was devastated - just because I was an extremely emotional kid who had decided that this was the most important thing in the world - and then obviously '04 cemented my love for the program (Duke hatred played a big role in this).
Honestly not sure I'd be a UConn fan today though if it wasn't for Jeff Adrien. My fandom wavered big time during those '05/'06 years for reasons that remain unclear (I'm the same person who abruptly stopped rooting for the Patriots after the second super bowl win, so I was a loose cannon), but having seen Jeff Adrien play a couple times at Brookline high I became a huge fan and followed him throughout his college career. Been die-hard ever since '07/'08, even broke some s___ to prove my mettle after the loss to San Diego.