Bart brings his pet to class for show and tell. It escapes and wreaks havoc on the school.
A character in a position of authority at Springfield Elementary complains when the students fail to respond to a joke that is essentially the same as another character's joke that immediately preceded it.
Sound familiar?
I've grown accustomed to the recycling of ideas from earlier seasons, but is it so much to ask that two distinct (and very specific) concepts from the same episode (in this instance, 1F18) not re-appear in one scene?