Never have. The offroading rock climbing thing. They had a course set up outside the SEMA show in Vegas. The idea is to simulate the challenges of driving over boulders and rocks with a highly modified all-wheel drive vehicle. Is this considered a sport? A hobby? What? It has no real world application, you could just walk this terrain instead and barely break a sweat -- the presence of the spotter underlines the absurdity of it all quite nicely.