Mid way through his presentation I got bored of him essentially repeating everything for the third time, and I noticed that the network cable of the podium went into the wall near the front of the hall, but all the cords actually plugged into outlets and sockets that happened to be right beside where I was sitting.

So I unplugged his network connection and sat there quietly to listen to the rest of his presentation.

How'd he react when his connection died?

He went through a few stages as far as I remember. Mild confusion "Why isn't this working", then on to denial "Things can't have broken, this must just be a slight glitch that will fix itself in a second.", and then on to frustration/anger.

Needless to say it generate a lot of good debate over the issue with regards to network reliability, and the audience basically came to consensus that while a centralized system for a building, similar to a mainframe style computing, would generally be acceptable risk, it was viewed that far external connections would be too unreliable to really make sense.