The loser memorizes the complete fight song of the league's most hated team or school and must perform it on demand, any time, any place, all year, whenever a leaguemate requests it. Refusal doubles the remaining term. The requests always come at weddings.
The long haul: this is not a one-afternoon sentence. With a time commitment of full year, the punishment keeps paying out (for everyone else) long after the season ends. Long sentences need a written end date and a league-appointed enforcer who checks compliance.
Seen in the wild: scoutcast.ai