Springfield Elementary earns a grant, thanks to Lisa's latest A -- a grade acquired by cheating. Meanwhile, Homer plans to fatten up a lobster, but becomes emotionally attached.
A sick-day puts Lisa in a difficult academic predicament: She wants to do her best on a reading test, but didn't study at all when she was home. After consulting with Bart, she reluctantly decides to buy the test answers from Nelson and scores a perfect A+++. But when her high test score raises Springfield Elementary School's average and earns the troubled school a huge state grant, Lisa is plagued with guilt. Meanwhile, Homer grows attached to a lobster that he brought home for dinner, naming it Mr. Pinchy. When Lisa admits that she cheated to Principal Skinner, he is disheartened but still wants to keep the grant money. Skinner and Chalmers trick Lisa into thinking that she's turned down the school's grant, but secretly keep the cash. Back at home, Homer loses his beloved new pet when he gives it a hot bath. Heartbroken but hungry, Homer bids farewell to his crustacean friend by eating it.