In the opening sequence of many "Simpsons" episodes, the camera zooms in on Springfield Elementary School, where Bart can be seen writing a message on the chalkboard. This message, which changes from episode to episode, has become known as the "chalkboard gag". Chalkboard messages may involve political humor such as "The First Amendment does not cover burping", pop culture references such as "I can't see dead people", and meta-references such as "I am not a 32-year-old woman" and "Nobody reads these anymore". The animators are able to produce the chalkboard gags quickly and in some cases have changed them to fit current events. For example, the chalkboard gag for "Homer the Heretic" (season four, 1992) read, "I will not defame New Orleans." The gag had been written as an apology to the city for a controversial song in the previous week's episode, "A Streetcar Named Marge", which called the city a "home of pirates, drunks and whores". Many episodes do not feature a chalkboard gag because a shorter opening title sequence, where the chalkboard gags are cut, is used to make more room for story and plot development.