When our band director was in high school he didn’t know what tacet meant. He plays percussion so he assumed that it must be some sort of instrument. He went up to his director and asked him where the tacet was. Being the nice guy that he was, his director told him that he thinks he saw it in the closet. He spent three class periods looking for it before his director came in and told him that there is no such instrument and that tacet means not to play.