Lisa, if you don’t like your job, you don’t strike. You just go in everyday and do it really half-assed. That’s the American way.— Homer
One of the staples of the Simpsons' opening credits is the blackboard gag. Bart writes something on the chalkboard as a punishment, quite often ironic. Here we list them all, including screenshots where useful. Any episodes not listed here do not have blackboard gags.
Season 12 starts 27th September.