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...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?
I think calling 4-5 perfectly in a row would get a few people to pay for predictions.
Though, if you were smart, you’d do what any bookie does and let people bet against each other.