Re: One rule for you...
I used to work for a security consulting company, where government work required quite a bit of physical security. This meant things like proximity cards everywhere, with a man-trap at the main entrance, and cameras covering all but the washrooms. There was also this eerie background mumbling noise from speakers, to make it harder for other building tenants to listen to conversations.
We had a couple fun incidents that come to mind, with being located in the inner city. Once, a couple of inebriated glue-sniffing gents managed to tailgate as far as the man-trap, where they got stuck. No way in or out, no windows, and just enough room for the two of them. Eventually they noticed and used the blue fire-style pull station that was used for emergency egress, while also setting off the alarm. Needless to say, our people had a great time checking out the camera footage later.
A couple others got into a basement break room, since the windows turned out to be not built to spec. The outer glass could be broken of course, but the plastic sheet on the inside could also be pushed in at the bottom to get in and drop down. They proceeded to ransack the place, leaving blood everywhere due to the broken glass on the way in. One was hanging on to the ceiling projector and trying to yank it off, when he saw the camera. They did manage to get out, but it took a while because that plastic sheet had again flexed back into place, not leaving anything to grab it by.