My favorite - sewing with no bobbin thread - has been taken. I'm convinced that the more difficult the seam - the greater the likelihood that it will have been done without a bobbin.
Also, there is removing something from the machine that needs some hand work, walking down the hall, through the dining room and kitchen and realize when you sit down in the family room that you forgot to clip the bobbin thread. (This is one time when it will not run out.)