The loser appears in a local holiday parade in a ridiculous costume, on a float if the league can arrange it. One documented loser rode a Coral Springs parade float dressed as Elsa from Frozen. Requires some hustle to organize, which is half the fun for the league.
Heavy sentence
Severity 4 punishments are the ones people talk about for years, which is exactly why they need full league buy-in before week one. Put it in the constitution, set the deadline, and agree on proof requirements up front.