When you work in your shop when you are out of it. Such as illness, tiredness, and just plain aggrivated with other things. Now that I have another health issue I want to go play in my wood shop. But I'm keeping myself away because I know that I won't 100% focused in my work and what I'm actually doing to my project so to be safe I'm reading books on wood working to keep the ideas coming and when I'm better. But until I start feeling better no shop time until then so I don't have any mishaps. I think this a good piece of advise for all even myself.