A Colorado father said he bought a box of cereal from Walmart this week and ate an entire bowl before discovering it had expired — 21 years ago! Josiah and Anthea Carelse of Lakewood said they bought the box of Quaker 100 Percent Natural Granola cereal from the Walmart in Littleton on Monday and they later sat down to eat some of the breakfast food. Anthea said she took only a couple bites before deciding something was off about the taste, but Josiah ate an entire bowl.”I just started eating and thinking, ‘It just tastes funny. It must be OK,'” Josiah said. The couple said it wasn’t until after Josiah finished his bowl that they noticed the “best by” date on the box: February 22, 1997! The Carelses said they plan to return the box of cereal to Walmart. A Walmart representative said the company is investigating the matter.