I have finally recieved my first injury during the coop build! I was securing a section of 2 x 4 to the top side of the next box and forgot to secure the far end. When I began to drive the mighty screw into the wood, the small peice swung around like a rocket and clocked me in the skull!!! After seeing a few stars, I gathered my thoughts, went and got ice and kept working! I will say, it left quite a nice welt and cut on my head. Just a word of caution.... I supposed safety galsses should have been in order too, live and learn I guess.