Bobbins almost always run out for me a couple of inches before the end of whatever I'm sewing. It doesn't matter if the machine is smart enough to warn me about it in that case for it to be annoying. I agree, though, that when you merrily - and very carefully and accurately - sew and sew and sew only to discover that it's been a good 10 minutes since any of the stitches took, it's especially painful. More so if it's the binding on a quilt you've worked on for months and you were so happy that it's done at last.