It was also important to keep the beer ice cold right up until the time you walked into the park. As an 8-year old, I enjoyed helping my brothers pour cans of beer into the cooler as we walked up 35th street toward Memorial.
Despite popular legend, Wild Bill Hagy (RIP) typically drank PBR at games, not Natty Boh. 
Also, ideally, one would keep the cooler submersed in ice until right before filling it with beer, pre-chilled.
Wild Bill came to some Terps basketball games for a while, probaby circa 1980. He'd lead his patented cheer, modifyed for the venue.
T-E-R-P-SThen after the game, he'd adjourn to the 'vous to down a few beers. The man was legit, in terms of drinking prowess. He didn't bother with cups, which must have seemed like thimbles to him. He drank directly from the pitcher, which cost $2.25 (60 oz.) apiece. Just walking around the 'vous, checking out the college girls, drinking beer by the gallon.
