You gave me a good laugh. I've never done that but have made some awful goofs. Just today was finishing my Christmas Block for the Swap Club. Noticed a white bias tape trailing my stitching. Tried to pull it out, didn't work. I had sewed some of this bias tape to the back of the appliques quilt block. After trimming it off as best I could, some of it is still there. Where did I pick up the trailing bias, Only my invisible critter knows.