I've actively pulled for Tennessee twice.
The first time was at the '85 UT-aubrun game in Knoxville. The girl I dated was an aubrun person, and we sat in the last row of visitors' seats in the end zone. Behind me was a guy in complete orange, including overalls. UT jumped out to a 7-0 lead and I sat on my hands. The lead went to 14-0 and I yelped a bit, but cowered from my lovely's caustic stare. When it hit 21-0 I was dealing high fives over her head with the orange overalls guy. Tennessee ended up winning 38-20. It was a long weekend.
The second time, I was hiking through the Smokies in 1991, and the only game we could pick up was the UT-Notre Dame game. Tennessee ended up winning in exciting fashion, and their excellent play-by-play guy John Ward made it difficult to not get into the game.
RTR,
Tim