Today, I had some free time so got out my sewing machine and threads to spend the afternoon creating. I set the two bobbin boxes on the kitchen table and walked the two or three steps to the sewing table. I sat down and stretched my foot out to press the pedal to get the sewing machine going. Behind me, one of the bobbins rattled loudly in the box . . . all by itself. Startled, I soon figured out that one of them might have been set in it's slot at an angle and just fell into place.
I continued sewing then got up to get another bobbin. Again, I sat down to sew and one of the bobbins popped up and rattled as soon as I started using the pedal on the machine. Earthquake? That only affected one bobbin? I shrugged and continued my work.
I finished the task at hand and had to go into the entry way where my spools of thread are stored. The moment I got past the sewing machine, the same pesky bobbin jumped up into the air, rolled off the table and rattled off into a corner . . . seemingly, by itself! Since it was broad daylight without dark shadows lurking, I went after the bobbin and picked it up. It had unrolled itself of a length of it's thread so I started rewinding it as I walked back to the kitchen table. I kept winding and winding as a huge amount of thread has escaped the captivity of the bobbin. Suddenly, I felt a pull on my shoe. I looked down and saw that the end of the thread was caught in my shoe lace. The answer to the 'spirited' bobbin! Every time I walked around the kitchen, it would pull the thread and jiggle the bobbin but when I walked further afield, it yanked it right out of the tray. Whew! Glad to discover the bobbin had no other abilities than being a handy, plastic item to hold my sewing machine thread!