Do shops still sabotage cars for profit?

The customer from hell...

Since this thread has seemed to taken a slide sideways: don't you like those mystery noises? Here's the RO, take the car for a ride, the customer's complaining about a noise in the rear.

Okay, no problem, grab the seat bag and the floor mat, hit the parking lot, take the car out. Only to hear five hundred noises coming from the rear. Pull over to take a look, because it's obviously in the car, not with the car and soccer mom has all five kids' sporting equipment rolling around in the back of the SUV. The shin guards, the football helmets, the soccer balls, all hitting each other. Throw in little Marcia's batton's from marching band practice and you have yourself a varitable symphony going on in the back of the car. And you can't hear one damned noise the car might be making because of it.

I love how the customers assume we drive their vehicles enough to know which one of the millions of noises it's making is the new noise, and then leave all their s*** in the car for us to have to unload in our bays to have to try to figure out what the vehicle is doing that it's not supposed to. Oh, and we haven't seen this customer since the car went off warranty fifty friggin' million miles ago. They've been told by another shop "it's a manufacturer thing, take it to the dealership, they'll know what to do."