One hundred burpee pull-ups, completed in a single session, filmed, however long it takes. The name comes from the movie's brutal training montage, and the reality is worse. Rest is allowed; quitting resets the count to zero.
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.
Seen in the wild: reddit.com