I once had 3 unmarked police cars and several other police on bikes converge on a parking lot that a friend and I had just pulled into. Apparently, a nearby pawn shop was broken into and we obviously fit the description. Things got even better when they found my camcorder in the car..
After searching the car and our pockets contents, and shying away from my camera, they eventually apologized and departed. It must have been a serious robbery because they never mentioned anything about me pulling into a parking lot piss drunk..