My biggest goof to date was that I accidentally quilted a whole quilt top inside another quilt. I had a pile I was sandwiching and this quilt top stuck to the back of the batting on top of it. It was slightly smaller so I didn't notice until it was missing. I felt sick when I peeled back some edges and found that top quilted into the other quilt! No, I did not pick it out, I just left it and counted it as my loss. Now I sandwich only one quilt at a time! No more stacks.