On Friday morning, I guess my concentration was elsewhere, but I executed a C&J poorly and clipped my chin with the bar giving myself quite the case of whiplash. I was shocked at how bad it was despite only being 35kg and the bruise on my chin not being that bad. But then I talked the physics of it over with my brother. All I can say is that clipping the chin w a C&J is way worse that doing it with an OHP. Physics cannot be denied.