I used to be with it, but then they changed what ‘it’ was. Now what I’m with isn’t ‘it’, and what’s ‘it’ seems weird and scary to me. It’ll happen to you!— Grampa
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.