I am left handed, and I have left-handed scissors. Left-handed thread? I think it's just a running joke between the two women who are left handed. If something doesn't come out quite right, they kid with each other it's because we
didn't use the left-handed thread. If something comes out good, we used the left-handed thread. Their mother doesn't realize it's just a joke between them and took them seriously. I am LOL with everyone else.