I had this much quilting done before I decided I didn't like the color of the thread I was using. After a couple of long lines of stitches I came to this conclusion and turned the piece over to remove the stitches and discovered that some how I had stitched a stray piece of cloth onto the back. There it was smack dab in the center where I would in no way logically place a sleeve or a label. Let me say, the sound I made can not be conveyed in the English language.
But then I laughed and thought I'd share this with you while I take a lunch break now that the stitches are all picked out and the offending piece of fabric now resides in the trash.