Two weeks ago, at an X block class, I sewed a bunch of strips together in the wrong order. Wide, wide, narrow instead of wide, narrow, wide. How could I have been so stupid? The teacher, bless her dear heart, just laughed and grabbed some of them, unsewing as she walked around helping people. Later, I sewed some blocks together in wrong order, too. But it's done now, and I love it. Not necessarily the worst mistake, but the most recent, and I remember it. LOL