Oh, I forgot about a good one. A lady brings in her 2000ish Audi something or other (they all look alike to me) for a no start. I get in and try to start it and just hear the "click-click" of the starter solenoid, thinking a dead battery. Get the guys to help me push it into the shop and I check the battery. Its good. I throw it up in the air to check the starter connections, their good. I hook my remote starter up to it and try it while tapping it with a hammer. still the same thing. For some odd reason I was looking around at other things while under the car and noticed the oil filter. The from the factory, oil filter. I then knew right then what the problem was. Dropped it down and checked the oil, nada. I then take a socket and breaker bar and try to turn the engine over, solid mass of metal. I then pull my hoist out and push the car out of my bay, and tell my boss that it needs an engine. Never in my life had I ever had so much trouble trying to explain something to someone. I finally got to the point where I had to put it in "simpleton" terms. "Oil is like a loaf of bread, If you leave it for too long then it starts to moldy and it isn't good anymore. If you eat it all then you have to buy a new loaf of bread. But if you buy a loaf of bread and eat some of it and then when it starts getting old buy another loaf to replace it, then you'll always have fresh bread. You need to replace your oil to keep it from going bad or being used up, you want it fresh". I then received a dirty look and later that day the car was towed away to another shop to get another opinion on it, I never did do the engine on it, and I was glad because I hate Volkswagen.