That's a good one I'll have to remember that one...lol
Here's a quick one from about 15-16 years ago. Running a fairly new shop, I had a lady come to me for a "second opinion". She had just come from a Firestone store where they they told her that her oil leak was caused by a bad oil pump. Even went so far as to have her sign a waiver stating if she drove it with the bad pump and the engine failed they could not be held liable. Now, she DRIVES it over to me about 9 miles away. Shows me the paper and the estimate to fix this "oil leak" and skip. Gauge reads fine... hmmmm... Pop the hood, valve cover gaskets are leaking a little on the plug wires on a 90-91 Taurus 3.0. I explain to her that if her oil pump was bad, there would be no oil in the top of the head to leak out the valve cover..

" I see" she says. I tell her to leave it for a few hours and come back and see me that afternoon after giving her a quick quote for the gasket and a minor tune up. Clean the throttle valve, fix the leak, plugs and wires, shes tickled pink says it runs better than it ever has and only spent a cpl of hundred bucks. From that day forward she always brought her families cars to me. and never questioned anything.
One day she has her husbands new Nissan Altima towed in, no start. At that time I was in a new world with imports. I messed with it for a day or so, and finally told her she was going to have to take it over to the Nissan dealer. I told her this is what I THINK the problem is but I cant prove it. So she says fine, tows it to Nissan and two days later it's back in my lot with a new distributor on the front seat and a note saying "Nissan says its the distributor, call me after you have it running, THANKS!"
She's still on my Christmas Card list.

There is always enough time to do it right the first time.