Ohhhh yeahhh. Just a couple days ago I was sewing 2.5 inch strips together, to be cut into units for piecing 4 patches. I ironed the side-by-side strips open. Then, instead of cutting pieces from the strip pairs 2.5 inches wide, to be sewn into 4 patches, I cut them 4.5 inches wide because that's the width of the finished block. So where did that leave me? Having to go back and cut each unit 2.5 inches, and throwing the now-too-small trimmed off part into the crumb bin.