The loser provides the full food-and-drinks spread for the league's Super Bowl party, weeks after their season died, forcing them to cater a celebration of a sport that betrayed them. Menu requests are taken and honored. Wings are non-negotiable.
Budget note: this is one of the expensive ones. Decide before the season whether the loser pays, the pot pays, or the league splits it, and write that down. Money arguments kill leagues faster than collusion.