When The Simpsons Opening Sequence was reanimated for its conversion to high definition in 2009, initially, during the screen showing the title, only one gag was used: a three-eyed crow would fly by it. Starting with Season 7 (and permanently with Season 21), the gag became a changing opening sequence gag for each episode just like the billboard gags, the chalkboard gags, and the couch gags. There is also a title screen gag for the movie.