It all depends on what I am walking through.

I was walking through an old brewery one time. It was one big crack house. So here I am worrying about getting shot and a pit bull comes running out and attacks me. Luckily, one of the guys I was with smacked it with a piece of pipe.
I had to go through the whole series of rabies shots Unfortunately, the only place to get the rabies vaccine was the "Baltimore County Office of Communicable Diseases" at least that was what the big sign on the front of the place said. I had to punch all the elevator buttons with the point of my elbow because who knows what funky crap those people in it had. So, I leave the building with a cardboard box filled with all the rabies vaccine in it and I am standing right under the aformentioned very large sign and damned if my next door neighbor doesn't drive by. The more I tried to explain, the less she believed. I think every Halloween after that she made her kids throw my candy away.
Walking through occupied housing projects is always fun. Cabrini Green was memorable as was the projects in Puerto Rico. About 30 cops showed up with bullet proof vests and machine guns for that one.
The Big Daddy of walk throughs was the Walled City in Kowloon. That walk through took a couple of weeks. It was composed of 577 intertwined buildings. None of which was built to code and there were no blueprints. The place was totally lawless. It wasn't claimed by the Chinese nor the British. A cop hadn't set foot in there in something like the last 200 years or so.