How come the Bruins haven’t dumped ice on their coach this century?
Because the guy who knew the recipe graduated.
Barry informed me that he first learned this joke while he was a student in high school. His father and mother are University of Southern California alums so they raised Barry to be a USC football fan. The background for the joke is that UCLA and USC have a heated rivalry in sports and academics, as both schools are located in the greater Los Angeles area and are very similar. Also, the ice being alluded to in this joke represents the ritual that football players will douse their coach with the ice and water that is found in their coolers. Barry explained that the joke just symbolized the intense competition between the Trojans of USC and the Bruins of UCLA.
While this joke may not represent an entire country or regions ideas, it is still considered folklore as the folk in this case are USC students, alums, faculty, and fans in general. Sports teams are usually followed by a large group of people who bleed their teams colors and share a large hatred for their teams rivals. This same hatred between two groups is seen across many different groups and helps bind them together to create their own folklore. Some other examples may be rival countries, states, gangs, religious groups, and many other groups as well.