Attention: TDR Forum Junkies 
back in the '80's when a buddy of mine was going to college in Ft Collins, he came home for summer break with a radar gun, at least the innards of one, that he and a classmate had made. We went out that weekend to visit some other friends and the 70 mile drive from Ft Collins to downtown Denver, we had "corralled" 18 assorted vehicles with radar detectors in front of us. Every time one of them would start to pull away, we hit the button, and the brake lights came on on all 18 cars. We dubbed it "nerd herding" It was quite a sight to see :-laf :-laf
As far as police with a sense of humor, a neighbor of mine was a Littleton cop. When he got bored, he would park in a parking lot just off a busy side street, get out of his patrol car and sit on the hood with his gun off. About every 10th car that he saw, the driver having noticed him sitting there with his radar gun would start beating up the "non functioning" radar detector on the dash.
