JugglingReferee wroteOnly the NFL cares about K's feet.
NFL Rule 2011
Rule 9, Section 2, Article 2
Item 2: If a player of the kicking team touches the goal line with any part of his body while touching the ball, the ball is dead, and the result of the play is a touchback.
Note: The spot of first touching is normally the yard line at which the ball is at when touched. If the first touching occurs while the ball is in the air above or beyond the goal line, and prior to the ball touching the goal line or the ground beyond the goal line, the spot of first touching is deemed to be the spot from which the touching player left the field of play, but in no event inside the receiving team’s one-yard line.