I can begin to tell you how often this happens . . .
When I was young, I would "sew" with Mom's machine - following a design drawn on paper - no thread in the bobbin or in the needle. It was fun to "air sew" then, not so much fun now! I'll admit sometimes a few choice words slip out of my mouth when I realize (after pulling out multiple pins) that I'd been sewing with an empty bobbin.