Writer Andrew Kreisberg was only on the staff of the Simpsons for two years before moving onto shows like Arrow and the Flash. He was the main writer for the Tony Hawk episode, and was involved in classic episodes like when Homer goes to Rock Camp, or when Homer moved out to the gay district of Springfield.
When buzzfeed decided to ask 51 TV Writers what bit of writing they are most proud of, Kreisberg chose one line that wasn't even used in the final cut of an episode, which is a shame because I could definitely see it being repeated in popular culture everywhere:
Ironically, it was a line that never made it to screen. One of my first staff jobs was on The Simpsons. We needed a throwaway line for Ralph Wiggum. I had started only the week before but I pitched he should be dancing around holding his crotch when he says, “I have to go number three.” It got a big laugh in the room and got in the script. It was actually animated but ultimately got cut for time. It didn’t matter to me because I got a lot of talented writers I admired to laugh.