Family Guy Season 12 Episode 17
The Most Interesting Man in the World
-After Lois leaves Stewie in Peter's care for the afternoon, she is disappointed to find that he left Stewie alone in the park and then took the wrong baby home.
-Lois tells Peter that he's stupid.
-Determined to get back in Lois's favor, Peter begins to take travel assignments around the country for work, and becomes exponentially more intelligent and cultured in the process.
-At first, Lois is delighted by the changes in Peter, but she soon becomes disillusioned.
-She develops a plot to bring back the old, stupid Peter: send him to Tucson, Arizona.
-It works, and dumb Peter is returned to his welcoming family.