I've heard a bunch of stories about people who are brewing and have the police show up. It seemed unlikely to happen here nowadays, since a lot of people brew and it has to be a familiar sight. When I saw the officer drive by I didn't pay much attention, but I knew he'd be back because there's no other easy way out of the neighborhood. I was kind of surprised when he stopped at the end of my driveway and got out.
The first thing he said was "what kind of beer are you making?" As it turns out, he's a homebrewer and wanted to stop in and check out my system and talk a bit about beer. We talked brewing, gadgets, etc for a while, then I gave him a sample to take home and he gave me his email address so I can let him know when various local homebrew clubs meet. Nice guy.