I asked him is he remembered the year the yewts went after the goalposts. He couldn't remember, but laughed and said we had done the same thing back in the 40s or 50s. I did a google search and found this:

October 10, 1942– Salt Lake City
BYU (1–1, 0–1) finally beat Utah (0–2, 0–0) after going winless for the first 20 games of the rivalry. Down by two late in the fourth quarter, BYU blocked a punt, and the ball rolled out of bounds at the Utah 10-yard line. Four plays later, BYU's Herman Longhurst ran in the winning touchdown from three yards out. Immediately after the game, Cougar fans stormed onto the field and tore down the goalposts, igniting a celebration that continued for three days. The following Monday, the Mayor of Provo formally proclaimed an official day of celebration.

Thought it was kinda funny. Weren't goal posts wooden back then? Tearing them down could be dangerous!