I once had an intermittent clunk sound in the glovebox area of my '98 Honda Accord. I took it in for service, and the tech put 25+ miles on the car trying to diagnose that clunk. All he found was my sunglasses in the overhead holder sliding back and forth. And of course, that was the cause of the noise. Now I make sure to completely empty the car of my belongings and listen for noises before taking it back to the dealer.

"When you get to the fork in the road, take it." --Yogi Berra