I had one, they gave me like a giant glass of castor oil few nights before...I believe they dont do this shit anymore...mine was while I was in the Navy, done at Balboa naval hospital. (wasnt done for traditional cancer check, but to complete a full upper/lower gi)
I swore that I would never ever do this again. My asshole was on extreme auto pilot, SEVERE shitting, sort of like dry heaves when vomiting, but my ass. My ass would heave so badly I would projectile vomit. I vowed that I would rather die instead of doing that ever again. Again, I know thats not how its done now, thank god!!
Only good part was that after 16 hours of auto pilot shitting, I didnt care if they stuck a shop vac up my ass...miserable.
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