Been there, done that! Too many times to count! I have learned to ALWAYS, after quilting a few inches, to reach underneath and FEEL the stitching. You will feel when the tension is bad. And eventually, you'll learn the sound it makes when the bobbin is making a big mess. Sorry it happened to you. Don't know if you got it frogged yet, but if you haven't, roll the quilt and go around the back to frog.........it really is easy when you've really screwed up. BTW -- LOVE the song!