The other day I was over at my friend's house helping him be Santa and putting together some toys. He was swinging the hammer and not quite connecting with his target. He's left handed, so I said with a grin, "maybe I should have brought my left-handed hammer."
My wife said, "there's a left-handed hammer?"
And we dudes just looked at each other. And I said, "it was a joke. There's no such thing as a left-handed hammer."
His wife said, "well, there's left handed scissors so we thought... forget it."