One of the best, and I think my first, incredible aggy rollercoaster derailment - which we called at the time a choke - happened in the 1963 game that solidified our #1 ranking (over #2 Navy and Roger Staubach).
On odd-number years, T-Day game was in College Station. It was chilly and wet.
We scored first, FG by Shoeless Tony Crosby, and led 3-0. aggy came back with a couple of TDs, one in 2Q and another in 3Q, missed the xp on the second one, and was up 13-3 in the 4th quarter. We scored early, went for 2, didn't get it: 13-9 aggy.
aggy had only won a couple of games all year, and they pulled out all the stops. One of their scores was a trick play, where the QB lateraled to a WR, and bounced the ball. I swear the nearest official waved incomplete, but maybe not. It worked as intended - the Texas D pulled up, and the WR threw a long pass to a wide-open ag. Damn.
With the clock running out, Texas mounted a drive, but then... disaster! Our pass was intercepted, and aggy just needed to take a knee and run the clock for the supremely satisfying win.
That wasn't enough for the ags, though... the interceptor apparently wanted glory, a pick-6 to cap off one for the ages. He tried to run it back, but was quickly corralled. Instead of going down, though, he tried to pitch it to a teammate. The ball went flying, Texas recovered it, with a fresh set of downs because of the double change of possession.
Texas drove and Duke Carlisle punched the ball in from the goal line with a minute left. We went for 2 - again - and didn't get it - again. But 15-13 Texas.
aggy had yet another massive choke to add to their heritage, and we had a New Year's Day shot at Roger Staubach and the Midshipmen. But that's another story.