Common variants on the typical kickoff format include the onside kick, in which the kicking team attempts to regain possession of the ball; a touchback, which may occur if the ball is kicked into the receiving team's end zone; or a fair catch, in which a player on the receiving team waives his entitlement to attempt a return in exchange for a chance to catch the ball without interference from the kicking team. Additionally, penalties exist for various infractions such as a player violating his position restrictions prior to the kick (5-yard penalty), or if the ball goes out of bounds before touching a player (20 yards or placed at receiving team's 40-yard line, whichever is farther).