Well, I gave my comps talk (senior thesis) on the Casimir effect last week. It went surprisingly well, though it took much longer to prepare a 70 minute lecture than I expected. There are few graphics on the web which really explain the effect in a sensible way, so I had to draw most of them myself. The audience even seemed to follow quite a bit of it—impressive for starting from ground zero and moving rapidly to quantum cavity electrodynamics.
When I went in to meet with my faculty advisor the next day, I was surprised to learn that the reason he had not kept any of our meetings, or indeed showed much interest in discussing my comps at all, was because he had somehow not realized that he even was my advisor! Apparently, when I finished the talk and he saw his name on the final slide, he was very startled and realized his mistake. I am somewhat disappointed by this, but on the other hand, it was nice to get away without significant critique.
All in all, he said it was a very nice talk, so I'm happy with it--even though I did place a-dagger instead of a on my vacuum cleaner. :) There are still two drafts remaining, but somehow this feels like the finishing point of comps.