Meanwhile, a note is sent out from the Springfield Elementary, informing parents that someone at the school has a peanut allergy so foods containing peanuts will no longer be allowed on school premises. An indignant Bart claims it to be unfair not to disclose the identity of the "kid", but soon discovers the "kid" is actually Principal Skinner. With this newfound knowledge, Bart forces Skinner to publicly humiliate and injure himself by threatening him with a peanut on a stick. After being advised by Comic Book Guy that the only way to stop Bart is to find his "kryptonite", Skinner breaks into the Springfield General Hospital and searches through medical records of Bart in the night, where he discovers that Bart is allergic to shrimp. The next day, Skinner counters Bart's peanut stick with his own shrimp on a stick, and Bart and Skinner clash "Star Wars" style with their respective "sticks". They eventually end up in a Thai food factory in the "Little Bangkok" section of town. They battle over a rickety catwalk, which is right above a vat of shrimp-peanut mixture. Skinner sees this and attempts to end the battle, but Bart defiantly rushes at Skinner, causing both of them to topple into the vat, and putting them in the hospital in the same room as Homer for their allergic reactions. Skinner is outraged to hear that Marge thinks Bart saved Skinner's life, and the two proceed to throw shrimp and peanuts at each other again, while a disgusted Marge decides to head over to the maternity ward observation room to see the new babies.