The most interesting part was taking the stuff that makes you shit beforehand. It's very salty tasting liquid, and in this case, you drink a cup every 15 min. About 90 minutes after you start, it all comes tumbling down. It said it would be watery stool, but what I didn't expect was the force with which the water would exit my butthole. It was like a damn firehose. Comically so. Out loud, to no one, I made exclamations. It was like a comedy show gag. But over a long period of time. So that's something you can have fun with.
Being under general anesthetic for the first time was not much fun at all, but the aftermath had a nice thing or two to it. One was lying down and being aware of how empty your bowels were. Kind of a cool feeling. I often think of what it must feel like after you get, say, a hysterectomy, and your guts reshape to fill in for something that used to be there. This was like a small and temporary version of that perhaps.
Also cool was getting some snaps of what they saw. Some things are private... but not much, so here's two shots of what I'm working with: