More mis-sewn blocks (yes, even same one 2 or 3 x) than I care to admit..
One rotary cutter accident, couldn't believe it as I am extremely careful. Wouldn't have believed it except for blood all over - while finger was still in shock and before pain set in.
While finishing a quilt for my niece, I was using a pair of applique scissors instead of a seam ripper to take out a part of the quilting I wasn't happy with. Cut into the flipping top, leaving about a 1/2" cut.
Most recently: Couldn't figure out why machine was balking. Yes, I was sewing through many layers on my Professional Tote, but still... Oh, what's that? My beautiful purple cutting mat had been picked up with the fabric and I'd sewn several stitches through it. Drat!!
Still, I think Bearisgray wins, not once but twice over!