Some days you go to the shop and it all runs like a fine clock. Every cut fits, every decision works. Your clamps hold the work in the right place until you finish nailing. You make that perfect mitered joint, no filler needed. The squeezeout of the glue is just right. More work gets done in a couple of hours than you imagined when you started the day.
Then there are the others. Nothing, and I mean nothing works. Every board has to be recut, nails miss their board, clamps slip. You can't find anything. Run out of glue. No screws. The nailer jams. Shit just happens and happens and happens.
Today was one of those latter type days. I used to force myself through and try to accomplish something. I've learned just to walk away. If in a couple of hours nothing useful has been accomplished other than raising my blood pressure, I quit and go home. It's not worth it. I usually have to tear apart whatever I did during those times anyway.
I'd rather make a customer wait, or my own projects wait, than half ass it fixing mistakes.