There are probably a few, but one job I know that I am definitely not qualified for is a barber. This morning, I decided to give myself a haircut. I don't have a lot of hair, and thus styling options, so it doesn't make sense to pay a barber $15 for what I can do in 2 minutes.
As you can see, I should have had my wife inspect my coiffure before I left the house. Luckily, I was wearing a hat when I was on the bus. When I got into the office, our Administrative Assistant informed me of the ill-placed stripe down one side of my head. One kind colleague said it looked like I had planned it. Another thought it looked like the time they didn't overlap their wheels when mowing the lawn.