Roughing the snapper
Penalty: Special teams
What it is
A defender makes illegal contact with the long snapper while he is in a vulnerable position right after snapping the ball on a kick.
The penalty
The penalty is 15 yards, plus an automatic first down. The penalty is enforced from the spot of the foul, and the kicking team gets a first down.
More detail
The rule exists because a long snapper has his head down and cannot see the rush as he snaps the ball.
Animated play
Blue circles are the team with the ball. X marks the other team. The yellow oval is the ball.