Yep...the seam ripper and I spent a lot of time together yesterday and today. The line looked like it was sewn perfectly straight when I attached the flap to the bag I am making for my son's girlfriend. But when I cut the threads and picked it up...it was crooked. So had to rip out through double layers of fabric and batting. I can't remember what I had to rip out yesterday. Anyway...when I finish ripping out the mistakes I usually take a short break and forget about it. By then I'm calmed down from being so mad at myself and then I start sewing again.