You might have to be an ex-racer to get this one.For my senior prank, my two friends and I snuck up to our hill at about one in the morning, the friday night before the last weekend of the season. We bought 25 pounds of the straight-line powdered chalk. in races it's used as like a finish line, and poured at the bases of each gate. Well, we got flourescent orange since its the school colors. And we wrote the acronym of my high school on the hill. literally, the two letters spaced the length and width of the entire run. and it was on the run under the main chair of my hill, so everyone saw it. the lines of the letters were about three feet thick, so it was obviously visible.