No Lions team had ever blown a 21-point lead, but Detroit was close to it after Tyler Shough found a rhythm in the second half in Week 1 of the NFL season.
https://www.foxnews.com/outkick-sports/lions-avoid-franchise-worst-collapse-defense-stops-saints-two-point-conversion-ot
https://www.foxnews.com/outkick-sports/lions-avoid-franchise-worst-collapse-defense-stops-saints-two-point-conversion-ot