Inspired by the most logical race in the galaxy, The Vulcans, breeding will be permitted once every seven years. For many of you, this will mean much less breeding. For me, much much more.— CBG
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.