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 takes a pretend bite. Seeing that Ralph is disappointed, he takes a real bite and Ralph asks if he could taste the thumbtacks. Clancy responds 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".