Five minutes of stand-up comedy at a real open mic, with material written by the league and designed to bomb. Some leagues forbid mentioning that it's a punishment, forcing the loser to own the silence. Widely considered one of the scariest punishments that costs nothing.
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.
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.