Oh, I have been there and done exactly that! In my second year of quilting I made a large red and white quilt for my best friend to thank her for teaching me to quilt. I was so darn proud...until I turned it over, and there was a HUGE folded over flap about 1/3 the way down the quilt from one corner. I had finished the quilting, and the only thing I would have done was rip the whole thing out. Well, since the backing was a very busy print, I just took some matching thread and sewed that flap down. It doesn't show. When I gave her the quilt I told her it had a very large "OOPS" in it. She said she would not be looking for it. I know if I asked her about it now, after 3 years, that she would still not know where it is. She loves me, and she keeps her word!!
Ha-Ha-Ha!!! :-D :-D