Oklahoma and Texas are two teams where the fans/teams have a true dislike for each other. Played at a neutral site each year (Cotton Bowl). Stadium split down the middle at the 50 yard line. Surrounded by the Texas State Fair.
The OU-UT rivalry currently is not as crazy as years past when folks used to make a barn fire out of the hotel furniture but still pretty intense. Heck, I've seen people put their condos up as trade for 50 yard line seats.