felipekk writes: "Hi all. I was amazed after receiving a link to one of maxcornelisse's videos on YouTube, where he shows how much fun you can have when you get access to the network behind several public services. I ask you, is it possible? In one of his videos, he hacks into one of the digital signs in the transit system and writes "Max is king:)" followed by his picture. In the other, gives the speakers a hard time after gaining access to the teleprompter controller in a live TV news broadcast. Are these systems really so weak?"