Who knows how accurate the clock really is in a football game? Starting the clock is imprecise, so the accuracy at the end of the game (or end of a quarter) shouldn’t be relied on, but they do. First-down measurements are the same way.
Is it a dead ball if the kickoff bounces before crossing the goal line? The video that @TheGunIsMightierThanThePen just posted has the ball bouncing into the end zone untouched, but still live. That was five seasons ago.
I guess that depends on how you define “fastest”. The safety occurred with less time elapsed on the official game clock, but that occurred on the second play of the game. The opening kickoff is the first play of the game, and Hester scored on that play; by that measure, no score could have happened faster. Hester’s TD also happened with much less real world time elapsed after the opening kickoff. By that measure, it’s easily the fastest in Super Bowl history, and I think the fastest in playoff history, although it still gets beat for fastest in NFL history by that Eagles-Cowboys game.
I know other opening kickoffs have been returned for touchdowns in non-Super Bowl NFL games, but I couldn’t find a list. It seems plausible that at least one other opening KO TD return would have taken less than 14 seconds, so I don’t know where Hester’s return ranks overall in NFL history for fastest score by time elapsed.
Under the current rules, it seems like if the ball bounces before crossing the goal line, it’s still a live ball and can be recovered by either team. But once it hits the ground in the end zone, it’s a dead ball. So, in theory, I think if the ball bounces before crossing the goal line and a member of the kicking team fields it off the bounce, in the air, before it touches the ground, it would count as a recovery by the kicking team in the end zone, and they would have possession at that point - which would be a touchdown. I think.
It also occurs to me that there’s some conflation and confusion going on in this thread (including by me) between quickest TD and quickest score (The OP themselves titled the thread “Quickest score”, but then asked about a “touchdown” in the body of the OP).
@Jasmine’s safety on the opening KO seems like it’s the quickest possible score - since the returner didn’t try to advance the ball, that would be a safety and 2 points scored by the kicking team with 0 time elapsed, right?
Can’t find a video, but I remember distinctly Michigan State v Notre Dame, where MSU took the opening kickoff which was caught just outside the goal line, The Spartan player took a step back and took a knee, and the clock still read 15:00 in the first quarter and ND had a 2-0 lead.