The Most Interesting Man in the World is episode 17 of family guy season 12. It was originally aired on April 13, 2014.

When Peter takes Stewie to the park for some quality father-son time, he mistakenly takes the wrong baby home, prompting Lois to call him an idiot. Determined to prove to her that he’s a responsible adult, Peter goes on a business trip to Chicago and returns as an intelligent, classy person.