tip #7 zen and the art of bobbin winding

My mother told me she used to get so frustrated when she would run out of bobbin thread.
She decided to time how long it took to replace a bobbin--it was under 30 seconds.
She figured 30 seconds was nothing to get upset about, and from then on, when a bobbin would run out, she would tell herself, "It is just 30 seconds" and carry on.
She would always wind 3 or 4 bobbins at a time so there was one ready to go. When she saw there was just one bobbin in the queue, she would watch for a good stopping time and wind up 3 or 4 more--never caught with an empty bobbin.