I was once taking photos of a brand-new sports facility at a local university that was just about completed. The campus security, having watched me for a few minutes without confronting me, decided that what I was doing was suspicious and called the cops. Four cops in two cruisers arrived and began yelling at me. I started walking over towards them to respond to their questions when they screamed stop where you are and put your hands on your head. One cop even pulled a gun on me, and I had not even opened my mouth yet. I was (at that time) a 22 year old student myself by the way-- what if I were a student there? They proceeded to search through my car, throwing everything on the ground. Once they had enough of searching, they allowed the conversation to begin. They let me stand up off of the curb and out of the wall of policemen surrounding me to speak with the officer in charge. He asked me some questions which I answered and they left me with a warning to never step foot on the campus again, an hour and a half of my time wasted, and a mess of my possessions (from my car) all over the ground in the parking lot.
Crazy.
Then again, I have been pulled over for speeding 9 times and have never been written up or issued a ticket (including once when I was going 130 in a 55)...