The loser signs up solo for a recreational sports league in a sport they have never played, and plays the full season with strangers. Weekly humiliation in front of a rotating audience. The fantasy league requires score reports after every game.
The long haul: this is not a one-afternoon sentence. With a time commitment of full season, 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: fantasyfootballunlimited.com