Jury duty for your butt

James Wolcott rhapsodizes over his recent colonoscopy: Anyway, don't let anyone deter you from a colonoscopy with their icky anecdotes. The Demerol drip is divine, the test can nip trouble in the bud, so to speak, and once you've had it, you won't need another for five years. It's sort of like jury duty for your butt, though perhaps that is not the most precise or felicitous analogy.