I'd heard horror stories about the colonoscopy prep. I took two days off of work; one for the op itself and the preceding day to spend on the toilet in agony. Supposedly after all the solid matter is cleared out (first one or two trips), things continue in liquid format for the next several hours. Diarrhea is easily one of my least-favorite experiences, so this sounded completely horrible. I made sure I had plenty of cannibus on hand, to help ease the suffering to whatever small degree it could.
It was nothing. Because this wasn't "normal" diarrhea brought on by some kind of bug or gastrointestinal issue, there was none of the accompanying distress and discomfort. Just several trips to the can, shitting out liquid instead of solid for a few minutes, then back to watching TV or playing on the PC. Completely painless. Annoying for sure, but not the horrible experience I was expecting. As far as I can tell, the magic formula they had me drink simply fooled my bowels into passing everything through the normally solid-only channel, and by around 4:00 in the afternoon, it was over. Then I was hungry until after the op the next morning because I couldn't eat anything and was totally empty inside. But that was actually the worst part, and hey, I've been hungry before so no big deal.