"A man comes back to the dealer with his new car and says....
M: My car doesn't work at night! Tech: Can I have the keys and try it? M: Yes!
The tech tries turning the lights on first, then starting the car. Then, he tries doing it in the opposite order. The car starts fine both ways and doesn't stall when the tech turns the lights on. He hands the keys back to the man.
T: If it doesn't work at night, next time, we'll take it back as a lemon, even if we can't reproduce the problem, and get you another car. M: Okay.
Sure enough, a few days later the man comes back.
M:The car still doesn't work at night? T: When you turn the key to try and start it, what sound does it make? M: The engine starts, but when I step on the gas it doesn't go forward, it just sits there and makes more noise! T: Can I sit in the passenger seat, and have you show me how you drive your car at night? M: Sure
They get in the car. The man turns the key, then pulls the gear lever to N
T: Why did you put it in "Neutral"? M: Neutral? Is that was N stands for? T: Yes M: I thought D was for Day and N was for Night!
The tech wrote in the repair log book "problem solved: found loose nut behind wheel"