Instructions to start the day

I stayed at the KOA campground in Flagstaff last night, suffering through a cold night before getting to enjoy a hot shower to start the day. I did not expect to find this sign in the shower. Is that a problem here? Is this a running gag at KOA campgrounds? Perhaps it's real message is to not pee in the shower and by using this message it highlights how disgusting it is to use the shower as a toilet (it's all pipes!) Or maybe being a social media society they figure it's funny enough to get that KOA logo going viral.