Wear a helmet especially when full of American Adjunct. Flesh heals but brains might not. It won't save you from every or somethings, but can save you from looking as gruesome as me. I casually ride a lot without a helmet. I do not trail ride or group ride without. I realize how quickly things can go wrong. If this happen on the road it could be permanent. I will not ride along with cars or on trails without one from now on.