The Grilled Crayon Sandwich was a sandwich containing crayons and thumbtacks made by Ralph Wiggum as an entry Auntie Ovenfresh Bakeoff, but was rejected. At first, Clancy Wiggum took a pretend bite. Seeing that Ralph was disappointed, he took a real bite and Ralph asked if he could taste the thumbtacks. Clancy responded with "Oh, Crap!".
It also appears in The Simpsons: Tapped Out as a one hour task for Ralph. in the game the task is known as "Eat a Crayon Sandwich"