his delusion of humanity, causing him to think he is a robot. Roberto, fed up with life in the asylum, breaks out and takes Bender with him. Back at the Planet Express building, Fry attempts to discover his function as a robot. He has no success as a "foodmotron" since no one wishes to eat the sandwiches from his "compartment" (the crotch of his pants), nor as a calculator since he cannot identify a plus sign, nor as a toolbot since he cannot unscrew a bolt with his bare fingers (even after he puts oil in his armpits). Fed up with Fry's attempts at proving he is a robot, Leela passionately kisses Fry in order to remind him of his humanity, but it fails to work. A newly escaped Roberto decides to rob the Big Apple Bank a third time, and Bender takes him back to the Planet Express building to hide out after nearly getting caught. The New New York police surround the building, and Roberto takes the staff hostage, including Bender who is now convinced that Roberto is a maniac. After waking up from a drunken stupor induced by "refueling" with alcohol, Fry, now convinced that he is a battle droid, takes on Roberto, who jumps out a window after stabbing a can of oil in Fry's chest pocket (thereby "proving" to Roberto he really is a robot and thus a battle droid). Roberto is apprehended by the police. Fry, seeing that he was cut and bleeding after Roberto threw the knife at him before jumping, overcomes his delusions completely. The Planet Express crew praise him for his bravery, with Leela kissing him on the cheek, and Bender tells Fry that he has the heart of a robot inside, just like the severed human heart Bender has in his own body, which he shows to everyone, much to their disgust. Cultural references The title is a reference to the 1993 Cypress Hill song "Insane in the Brain". It also doubles as a reference to the lyric "insane in the membrane", which is often mistaken as the title of the song. The name "HAL Institute for Criminally Insane Robots" refers to HAL 9000, a spaceship-installed robot from the Space Odyssey series that murderously turns against its human crew. The robot Nurse Ratchet is an allusion to another nurse from Ken Kesey's 1962 novel One Flew Over the Cuckoo's Nest.