I don't know if this is illegal or anything, but if a moderator thinks so, then please, delete the post. It seems pretty harmless to me.
You know those security cameraes you can control through the internet, such as changing the angle and stuff ?
Well, they all use the same URL, and if not password protected, it is very easy for anyone with an internet connection.
Just try this search:
http://www.google.com/search?q=inurl...1&start=0&sa=N
There you can mess around with security cameras =)