I'm stunned what I found in cefalon's 20C3 gallery: a picture from my lecture, i.e. showing me on the stage, and the crowd actually listening to me. You can see it
here. So this makes it pretty easy to estimate how many people actually were at my lecture. But what I can't see on the picture are the h0rny ch1x0rz sitting in the first row on the left (from my view) during my lecture. Well, I guess this is what every lecturer at 20C3 dreams of: groupies. Just let me my dreams, even when they have not become true.