This is the mini-golf one right? Lisa takes Bart to get books on better golfing for his match against Todd.

Don’t recall this particular joke but do remember the one where they’re checking out and Bart says we can’t afford all these and Lisa responds we’re just borrowing them, followed by a conspiratorial wink from Bart and a gotcha.

Bart walks in the Library and says something about ‘wow I didn’t know they had so many books here’ or something like that.

They’re doing some sort of research. Are they looking for the original creator of Itchy and Scratchy?