The feces are formed in the colon and pass down into the rectum by the process of peristalsis. When the rectum is sufficiently distended, nerve endings in its wall signal a need for evacuation, which is made possible by a voluntary relaxation of the sphincter muscles around the outer part of the anus.
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@Mike Murphy: Unless you have a Citi AA Amex card there is no way you used a Visa or Mastercard at Costco stores. These are the only ways you can pay at Costco stores today: Cash, check, debit cards, Costco Cash cards or American Express credit cards. FYI: The Citi HHonors Reserve card is a Visa Signature card so Citi does have some exposure with respect to Visa cards.