All right, you scrawny beanpoles: becoming a cop is not something that happens overnight. It takes one solid weekend of training to get that badge.— 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.