Bart's New Friend is the 11th episode of Season 26. It aired on January 11, 2015.
There is a retirement party at the Springfield Nuclear Power Plant. Homer is shocked to discover the man retiring, Don, is also a safety inspector at sector 7G. Homer has not done any real work for years, Don had done the full workload by himself. After Don's retirement, Homer is preoccupied with work at the office and at home. Marge decides to spend the day at the circus with the family. When at a hypnotist tent, Homer is hypnotized into thinking he is ten years old and before the hypnotist Sven Golly can undo the hypnosis he runs off to escape an arrest by the police. Homer is stuck thinking he's only ten years old.
Bart's New Friend is based off a script written by Judd Apatow, 25 years before the episode's airing.