…the next pick to the people who saw you pick the “winner”. Now half of those people see one team, the other half see you pick the other team, and whoever saw you pick the winner thinks you’ve got a 100% accuracy rate over two games. You could do that for a while and then offer to sell your pick for the Superbowl. Starting with a big enough group in the beginning, this might be really lucrative.
But is it legal?
Given someone found it has an official name (Psychic Sports Picks Trick) i’m sure it’s not even close to impossible.
It should be mentioned though that it sounds like you’d need a massive pool of people for it to actually work.