When I was a teenager, a cop drawed on me and my friend. As I pulled into my friends driveway the cop turned on his lights and parked behind my car. Didn't notice until we were getting out, so the cop drawed his pistol, pointed it at us and yelled for us to get back in the car (was "pulled over" for speeding).

I've also been woken up by police carrying AR-style rifles during a raid (not for me, for my previous roommate).