That's spot on. I've had a colonoscopy as a precaution after seeing blood in my poo (can't bring myself to use the word stool here). The preparation involves taking a very powerful laxative which cleans you out completely. You end up going to the toilet a lot passing what quickly becomes a clear liquid after a couple of trips. This goes on for hours and is unpleasant. But, hey, just unpleasant, nothing more.

The actual procedure does not take long (tens of minutes) and they gave you something to make you feel drowsy. I was fairly awake and enjoyed watching the inside of my body on the screen; others can just layback and do nothing.

On the upside the doctor wrote "Excellent bowel preparation" on my report afterwards so... Achievement Unlocked!