I suppose I'm a bandwagon fan. I've been one since 2003-2004. I was a Tampa Bay Bucanneers fan and was really excited to see Seattle playing an exciting brand of football. (That and they moved from the AFC to the NFC. I don't like the AFC- if they never came over the NFC I would never have become a fan.)
My Bucs were losing all the players I "cherished" at the same time Seattle was fun to watch, so I switched allegiances. In 2004 I nearly threw my remote control through the TV after the Rams had that miraculous comeback in Seattle with only 5+ minutes to play and win in OT.
I remember watching one of the greatest Football games I've ever seen in Seattle vs. Giants in 2005 that went into OT, with their kicker missing 3 game winning FG's, only to have Hackett catch a big pass and Alexander break off a nice run for Brown to ultimately hit the game winner.
So I've been a "Bandwagon" fan for 10 NFL seasons now. I loved me some D-Jack- Darrell Jackson. I also loved Michael Boulware.