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Only one: You're willing to undergo having a metal snake inserted into your [http://theoatmeal.com/comics/selfie_public bum hole].<ref>[http://theoatmeal.com/comics/selfie_public The Oatmeal's How to Use a Selfie Stick without Bothering Others]</ref>

The most important part of the '''colonoscopy''' is the [http://gomerblog.com/2016/09/its-time-for-a-seasonal-pumpkin-spiced-bowel-prep/ bowel prep]. For more information, please refer to [[Bowel Prep]], [[GoLYTELY]], or [[GoHEAVILY]]. Word of warning: Bowel preparations may cause diarrhea and force cancellation of the '''colonoscopy.'''<ref>[]http://gomerblog.com/2016/04/diarrhea-2/ Patients Cancel Colonoscopy Due to Diarrhea]</ref> If this does occur, do the right thing and blame the doctor.<ref>[http://gomerblog.com/2015/09/colonoscopy-bowel-prep/ Poor Colonoscopy Bowel Prep Blamed on Doctor]</ref>