It's not an uncommon play in football. A defender encroaches on the line of scrimmage, perhaps fooled by the quarterback's cadence. Flags fly, the ball is snapped and the offense has what's known as a "free play." If something goes wrong, of course, the play can be nullified by accepting the penalty. So it makes perfect sense to go for broke, so to speak, and I bet you can guess who the most aggressive quarterback in the NFL is in such situations.