D-Day....or should I call it C-Day?

Today is colonoscopy day.  Have to drink another 32 ounces of the lovely prep stuff in about an hour.  I am SOOOO hungry since I have had no solid food since Sunday evening.  My great fear now will be getting there and the doctor saying "oh not clean enough" even though I followed their directions to the letter and drank every bit of the yukky stuff!!  Keep your fingers crossed that it turns out 'clean as a whistle'!