So this out of work machinist from the big city is out in the countryside looking for a job. He stops at a blacksmith shop and asks if the blacksmith has any work. The blacksmith asks, "have you ever worked in a blacksmith's shop?".
"No, but I'm a pretty good machinist and I'm a quick learner".
"OK, I'll give you a try. I have to run into town for some supplies. This horse need a new set of shoes. You can shoe him while I'm gone and if you do a good job, you're hired."
The blacksmith returns from town and looks at the horse. "that is the prettiest job of shoeing I've ever seen. But tell me, why is he lying on his back with his feet pointing straight up?"
"I don't know. He's been like that ever since I took him out of the vise."