toward the opponent's goal line, the ball is moved back to the spot of the fumble. If the fumble occurred on fourth down, the defensive team gains possession on downs unless the original fumble occurred after the line to gain had been reached. Field goals, singles, and touchbacks In Canadian football, any kick that goes into the end zone is a live ball, except for a successful field goal or if the goalposts are hit while the ball is in flight. If the player receiving the kick fails to return it out of the end zone, or (except on a kickoff) if the ball was kicked through the end zone, then the kicking team scores a single point (rouge), and the returning team scrimmages from its 35-yard line or, if the rouge is scored as a result of a missed field goal attempt, the receiving team may choose the last point of scrimmage. If a kickoff goes through the end zone without a player touching it or a kicked ball in flight hits a post without scoring a field goal, there is no score, and the receiving team scrimmages from its 25-yard line. If the kick is returned out of the end zone, the receiving team next scrimmages from the place that was reached (or if they reach the opponents' goal line, they score a touchdown); in the amateur levels of the game, they are given the ball at their 20-yard line if the kick was not returned that far. Singles do not exist in American football; however, only one point is counted when a safety is scored during a conversion attempt, in contrast to the two points scored on other safeties. American football also allows a defending team to advance a missed field goal; however, because of the absence of singles and the goalpost position at the back of the end zone, the return is rarely exercised, except on a blocked kick, or as time expires in the half or in the game (with the most famous recent example being Chris Davis' game-ending return of a missed field goal for the winning touchdown in the 2013 Alabama–Auburn game). Most teams instead elect not to attempt a return and assume possession – at the previous line of scrimmage in the NCAA and at the spot of the kick in the NFL. Since the goalpost is out of bounds, any nonscoring