Hey, do you know what is really funny to do at a government building? I did this in the pentagon when I visited there a year ago. Every time you pass a security camera, look up at it for a few seconds, then open a small notebook and start writing random things (it doesn't matter what). After I did this about 6 times, I swear there were people following me. Where ever I went they went too, and always were far TOO absorbed in looking at whatever we were near when I glanced in their direction.
You know why they did this?.........
They thought I was mapping their security system!!