Wearing the mask on the course would be a litigation nightmare. For example, if you struck a ball towards a fellow competitor up on a different fairway and had to scream at the top of your lungs FORE!!! the extra exertion of oxygen into the mask could cause you respiratory problems and render you unconscious. On the other hand if you took the time to remove the mask before yelling FORE!!! it would be to late and the ball would have already struck that person and then we have the problem of removing the body from the golf course. So the only suggested remedy would be just to thrust your arm high into the air waving it about while extending four fingers hopinh intended victim or one of his threesome are looking in your direction.