For me it was the Paul Allen "NOOOOOOOOOOOOOOOOOOOOOOO"!!!! game against MN where McCown threw the last play TD. I don't remember the year, 2003?, but seriously, after that, none of my wife's family EVER talked crap about the Vikings again. Most of my co-workers and friends quit too. If you recall, the Vikes needed to win that game to get to the playoffs but, instead the hated Packers got in.
Of the ones listed, gotta be the Seahawks sunday night game. The game last weekend was awesome, but I hated the Seahawks sooooo much more at the time than I do the Rams today for some reason.