The loser is handed an instrument they cannot play, recorder, flute, kazoo optional for the merciful, and must busk in public until strangers have donated a set amount, usually $10 to $20, which goes to the champion. None of it is fast. 'Hot Cross Buns' echoing across a college quad is the sound of accountability.
Budget note: this one costs nothing but dignity, which makes it a strong pick for leagues that would rather spend the pot on the champion than on the loser's downfall.