Hot Cross Bunny.Bugs is "Experimental Rabbit #46" in the Eureka Hospital Experimental Laboratory, Paul Revere Foundation (which sports the slogan 'Hardly a man is now alive' in punning allusion to Henry Wadsworth Longfellow's "Paul Revere's Ride"). Bugs lives a pampered life, oblivious to the fact that a scientist plans on switching his brain (or at least his personality, since no surgery is involved) with that of a chicken. After giving Bugs an examination (including a joke when Bugs reads the microscopic "Allied Trades Council" union disclaimer on an eye chart when told to read the bottom line), the scientist brings him out to the operating theater, in front of an audience of fellow doctors. Bugs thinks he's been brought out to perform. He pulls out all the stops, singing, dancing, scatting (a la Danny Kaye), comedy routines (including his impression of Lionel Barrymore), and magic acts. Upon finishing each act, he looks around to see the unimpressed, stern-faced doctors in exactly the same frame position each time ("What a tough audience! It ain't like St. Joe!"). The scientist attempts to retrieve Bugs, but is pushed away. He strikes Bugs with a hammer while the rabbit is in the middle of a scat routine, but Bugs quickly revives and, having failed as the entertainment, becomes a vendor instead, selling hot dogs to the scientists, only to be hammered again. Learning the scientist's intentions, Bugs runs and a chase ensues...