After a three-and-out by the Falcons that saw a 3rd down catch by Harry Douglas ruled incomplete on a challenge, the Saints' Lance Moore returns a Michael Koenen punt 72 yards to the Falcons' six-yard line.
Three plays later, Drew Brees finds Jeremy Shockey for the game's first touchdown.
From Football Outsiders:
Mike Smith wastes a challenge two minutes into the game and then Lance Moore returns the ensuing punt to the five.