My freshman high school science teacher was Mr. Rapp. He had 2 boards. A smaller one about 18" long and about 6" wide made out of pine that he used most of the time with a mild smack that got you to pay attention, and then a much larger one made out of oak that with "RAPP" engraved backwards so, in theory, his name could be read on your butt if he hit hard enough. Wes Orland was a 6' 400 lb. delinquent that was in his 3rd year of taking this class, and had a knack for not wanting to pay attention in class. One day Mr. Rapp finally had enough and when Wes actually challenged him to hit him with the big board, Mr. Rapp took him up on it. Hit him so hard, it picked him up a good 4-5 inches off the ground, broke the board in question. Apparently, Rapp was readable for months. Shortly after that incident, all the paddle boards around school were no longer seen in the classrooms and Mr. Rapp had to transfer out of the district at the end of that year, despite being one of most popular teachers in the district. We still had him back as our commencement speaker when we graduated though.