like everone has said, FIRST rivalries are fun, entertaining, and exciting. One i always look forward to is 11 and 816. Now if you know these teams, this is most definitely not a rivalry with any bad blood, in fact the two teams have been looking to ally with each other forever... they really love each other...
but.... they always manage to be on the opposite side of the field when it comes to elims... they finally managed to pair at philly this year, but at the last two NJ regionals, they have faced each other in the elims, 11 winning '08, 816 winning '09... this is my favorite "rivalry"... especially since the two involved are really good friends on and off the field...