Fat Tony is a cancer on this fair city. He is the cancer, and I am the... uh, what cures cancer?— Wiggum
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.