Want to add on to your comment . Not only is the water violently thrashing about , it gets super aerated so all the normal sense of gravity is lost and visibility is zero . I once got churned so long that I started running out of breath . Started swimming with no sense of direction in a total whiteout . I hit the bottom with my right arm was somewhat rolled on my side . Was able to feel my way to putting my feet on the sand , and then shoving off away from it . Came shooting up like an emergency surfacing sub , grabbed a quick breath before the next set hit me on the face . Had to take a little beach time after that one . <| sep |> Thats ridiculous . Permanent marker comes of whiteboards with alcohol or simply by scribbling over the sharpie with dry erase markers . So I dont know if you ' re lying or if your principal is a real fucking asshole . If the latter , tell your parents to fight it .