Nails on a Chalkboard

Some people cringe at the sound of nails on a chalkboard or silverware clunking against peoples teeth, I however can't stand the sound of the metal part of a pencil just below the eraser scraping against paper. Ugh, I'm getting the shivers just thinking about that awful sound. Last week during a review test one boy started erasing and the metal part hit the paper and I almost freaked. I literally rushed over to him and handed him another eraser to use. The ear piercing sound was ringing through my head the rest of class.