I also did some chain piecing for about 30 minutes and realized I was out of bobbin thread. I also have sewn my shirt tail to the underside of the quilt. I also grabbed up the wrong filled white bobbin and used it.....and then when checking the back of the quilt, saw it was kinda shiny. It was my bobbin thread for my embroidery machine.
rip it...rip it...rip it.......I'm an expert at that.