A long-time USC fan told me that in the 1950’s and early 1960’s, if you headed over to Julie’s Restaurant after a game, the crowd would become more and more boisterous.
Eventually, there would always be some fully-clothed fans who would jump into the swimming pool in the back patio.
“People were cheering and celebrating,” the fan said. “Sooner or later, they would jump into the pool.”
The only time I saw someone jump in the pool was when USC basketball coach Stan Morrison promised to take the plunge if the Trojans made the NCAA Tournament.