CHARLOTTE - Signs on the porta-potties in the parking lot at the Coca-Cola 600 NASCAR race in Charlotte, North Carolina on Sunday poked fun at the ongoing controversy in the state--and the nation--over a bathroom law that requires people to use public restrooms that correspond to their biological gender. Take a look: View image on Twitter NASCAR has a sense of humor. North Carolina Gov. Pat McCrory is in attendance and received a mostly warm welcome and cheers from the crowd. Update: The signs were removed.