That's a lesson Solid Gold Bomb, a retailer selling through Amazon, learned when offensive T-shirts were discovered on its sales page this week. The shirts were "parodies" of the "keep calm and carry on" slogan that's been trendy for a few years. Except these versions had some offensive, misogynistic taglines: "Keep Calm And Rape Off." "Keep Calm And Knife Her." The shirts have since been pulled from the store.