I love it when brands finally catch on to jokes the rest of us were making in fourth grade. This time it's Charmin, which treated fans at the Charlotte Motor Speedway's Sprint All-Star Race to an underwear-shaped billboard that said "Stop Skidmarks." That phrase also applies to cars, you see. Given the kinds of ostentatious crap we often see with billboard design, this idea was refreshingly concise and to the point, if a tad juvenile. And it's certainly less offensive than the "Back Got Back" commercial. Photo via @trippmickle.