I teach P.E, and one day I marked off the playing field with cones so the students would know where to play. During a third grade class I explain where they could play and told them that they were not allowed to go past the markers, meaning the cones I put out. After a few minutes a student came up and looked at me with a confused look on her face. She says, "Coach where are the markers you said were on the field? I pointed to the cones and she said, "No, the markers we can write with"? I looked at her with a smile and said, "I meant the cones".