The Department of Natural Resources scrubbed the surface of Belle Isle State Park, sprayed water and advised riders to lean forward inside their burlap sack. Indeed, some people found the transparency more comfortable than it was. WDIV-TV reporter Nick Monacelli told viewers on a live report that the slide was slower. “It helps,” he said of adding water. “I still don’t get it, the friction, but it helps.” Video of high-flying riders made the rounds on social media last weekend and even earned a mention on “Jimmy Kimmel Live!” It also inspired Detroit rapper Gerald Allen, who performs as Gmac Cash, to write a song. “It’s like jumping off a roof,” she sang. “Man, you could lose a tooth.” “It’s like jumping off a roof,” sang Detroit rapper Gerald Allen, who performs as Gmac Cash. “Man, you could lose a tooth.” AP Cash appeared on Friday to test transparency. He said his eyes were closed. “I’m not taking it again. … It was abnormal. It hurt,” Cash told WDET-FM.