I always have fun at the thought that someone could be looking at the camera images at that time. The military guard in the background is a good bonus for this picture (see detail image).
Detail of plate and military guard. The plate says “This place is protected by a closed circuit TV system”.
Here is a picture taken in the Googleplex Belgium during a Cafenumerique dedicated to the Webmission, a group of belgian developers and entrepreneurs visiting the US during Google IO.
You can see the Google logo of course, but also a CCTV panel warning that you are currently being watched 
Taken by @Seynaeve
During the conference, I reminded TweetWallPro to take a picture during their stay at Google IO, and they did it. Here it is:
@zorrobiwan at Google IO