of the elementary school changes (since 2009). Bart writes something different on the chalkboard in every episode. Lisa may play a different solo on her saxophone (or on a different instrument entirely). Homer's scream changes as he dodges Marge (first two seasons only). The Simpsons attempt to sit on the couch as something goes awry in an often surreal manner. In the 2009 intro, Ralph says something different when the head of Jebediah Springfield falls on him (selected episodes in season 20 and season 21). At the end of the sequence, the TV set sometimes comes loose from its wall mount and smashes on the floor (since 2009). Billboard gag The billboard gag is a running visual joke added to the opening sequence with the updated 2009 high-definition opening. In the gag, a billboard is seen on the roof of the building across the street from the elementary school as the camera pans through the town. The billboard changes every episode. The first episode with a billboard gag was "Take My Life, Please" where the billboard says "Krusty: Now Doing Funerals". Chalkboard gag The chalkboard gag is a running visual joke that occurs during the opening credits of many episodes. In this gag, Bart Simpson is writing lines on the chalkboard as a punishment; when the school bell rings, he immediately stops writing and runs out of the classroom. The phrase he writes on the chalkboard changes from episode to episode. 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" (The Sixth Sense) and "I was not the sixth Beatle", and meta-references such as "I am not a 32-year-old woman" (in reference to Bart's voice actress Nancy Cartwright) and "Nobody reads these anymore". When possible, Bart is shown deliberately disobeying the line that he is writing on the chalkboard (e.g. squeaking chalk when asked to write "I will not squeak chalk", putting in ditto marks for "I will not cut corners", showing dis-coordination with "coffee is not for kids", or putting "I will finish what I sta" for a single line). In The Simpsons Movie, the gag, "I will not illegally download this movie", is a reference to piracy. In MyPods and Boomsticks, the couch gag was the family finding Bart writing "I will not bring the chalkboard home" on a chalkboard in front