Quarterbacks have frequently achieved a 100 percent completion percentage in single games, but these occurrences are almost always restricted to players who attempt a very low volume of passes during blowout wins, short relief appearances, or trick-play scenarios. In the official record books, numerous backup quarterbacks who entered a game for just one or two snaps and completed their lone pass hold a technical 100 percent completion rate for that contest. However, for a starting quarterback throwing a substantial number of passes over an entire regulation game, achieving a flawless 100 percent completion rate is extraordinarily rare due to dropped passes, throwaways, and tight defensive coverages. A few notable starters have approached historical efficiency marks by completing nearly all of their attempts—such as Ben Roethlisberger or Kurt Warner posting historic single-game completion rates above 85 to 90 percent with high attempt volumes—but sustaining a complete, unblemished 100 percent success rate across a meaningful starter's workload remains virtually unprecedented.