Ok, you folks will like this...
A few few years ago, I was coming home from work with a coworker, and was merging onto Rte 3N in MA, from 495. My car has a Stromberg performance exhaust, which is louder that normal, but not outrageously loud (unless you floor it, which I don't do during normal driving).
In any case I was merging into traffic, accelerating moderately from 30-50 mph (heavy traffic), right by where those tall noise barrier walls are (read amplifiers). A trouper was traveling on 3N and was a few car lengths behind me. He flashed his blues and pulled me over.
I waited till the end of the merge and pulled over. I figured I'd be polite and turned off my engine (had no clue as to why I was pulled over), put my hands on the wheel. He came up on the driver's side and asked for license and registration.
When he returned, he asked me to press the gas pedal. Somewhat confused as to the request, and even more so because my car was off. I pressed the gas, as he said, and asked no questions. I was pretty loud with all the cars going by. He asked me to do it again while he leaned towards my engine area to listen. At that point, it started to dawn on me, that he must have thought the car was too loud.
He handed back my license and registration, and walked back to his cruiser. Never stated why he pulled me over. Nevertheless, I started up my car and drove off...
Thought you'd enjoy the humor of it all...