Dr. Oz tells Oprah what poop can tell us.

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Question 1: What shape should your poop be?
A) Pancake-shaped
B) S-shaped
C) Pebble-shaped
D) I refuse to look.

The correct answer is B.

"It is supposed to be S-shaped , and for a very good reason," Dr. Oz says. "Poop, before it comes out, gets stored in the bottom of your rectum. And if it's unable to be stored there and achieve that shape, it means that your waste is not working well.

"Now we joke about this a lot, and that's all fun and good, but the reality is it's one of the best ways for us to audit how you're doing. If we don't know what's coming out of you and if you're not keeping track of it, we can't figure out [if] the machine's working the right way."