The Simpsons Movie

There is a short scene featuring the Simpson family during the credits, and another short scene featuring the Squeaky-Voiced Teen at the end.

Details
While the credits roll, the Simpson family is revealed to be sitting in the audience watching the movie. Bart wants to use the bathroom, complaining that he has been "holding it in" since the dome was put over the town. Homer forces him to stay, saying "A lot of people worked very hard on this movie, and all they want in return is for you to memorize their names!" Nevertheless, once Lisa has been satisfied that "No animals were harmed during the making of this film", the family gets up to leave. As they go, Maggie takes out her pacifier and speaks her first word: "Sequel?" At the end of the credits, the Squeaky-Voiced Teen enters the theatre with a broom (from the bristles of which he pulls a chunk of chewing gum) then proceeds to sweep the floor of the auditorium. He reveals that he is the Assistant Manager of the cinema, but that the job is not all it is cracked up to be. On the way out he mutters "4 years of film school for this?"