Question:  P.S. I Love You is the 15th episode of the eighth season of what television comedy that premiered in 2012?
Context: "Undercover Boss" is an American 2010 reality television series, based on the British series of the same name.  The first episode of the first season premiered on February 7, 2010, after Super Bowl XLIV, and featured Bob O'Donnell, President and Chief Operating Officer of Waste Management, Inc.  On March 9, 2010, CBS announced it had renewed "Undercover Boss" for a second season.  On July 28, 2010, CBS announced four company executives had signed up for the second season of "Undercover Boss", the executives are from NASCAR, DirecTV, Chiquita Brands International and Great Wolf Lodge, Inc. The Choice Hotels CEO, Steve Joyce, was the first boss for the second season of the show on September 26, 2010.  On March 27, 2011, CBS officially renewed "Undercover Boss" for a third season.  On May 18, 2011, CBS then announced that it would be holding the show for a mid-season replacement to premiere Sunday January 15, 2012, with an undetermined amount of episodes.  The third season premiered on January 15, 2012.  The fourth season premiered on November 2, 2012.  The fifth season premiered on September 27, 2013.  The sixth season premiered on December 14, 2014.  The eighth season premiered on December 21, 2016. "Brian & Stewie" is the 17th episode of the eighth season of the American animated television series "Family Guy", and 150th episode of the series overall.  It originally aired on Fox in the United States on May 2, 2010.  The episode features anthropomorphic dog Brian and baby Stewie after they are accidentally trapped inside a bank vault over a weekend.  The two are ultimately forced to reveal their true feelings about each other, and eventually go on to question each other's existence and purpose in life.  Brian and Stewie become even closer to each other as time goes on, and climactically help each other survive being trapped inside the vault.  The bottle episode breaks from the show's usual set-up, and is the only episode of the series not to feature any music or use any cutaway gags with Brian and Stewie being the only two characters featured in the entire episode.  In repeats of the episode there is no main title sequence, nor is any music played over the end credits. "Return" is the 15th episode of the first season of the CW television series The Secret Circle, and the series' 15th episode overall.  It was aired on February 16, 2012.  The episode was written by David Ehrman and it was directed by Brad Turner. "The Susie" is the 149th episode of the sitcom "Seinfeld".  This was the 15th episode for the eighth season.  It aired on February 13, 1997. The eighth season of the American television comedy series "How I Met Your Mother" was announced in March 2011 along with confirmation of the seventh season.  The season premiered on September 24, 2012 and concluded on May 13, 2013. "P.S. I Love You" is the 15th episode of the eighth season of the CBS sitcom "How I Met Your Mother", and the 175th episode overall. The eighth season of the American comedy television series "Scrubs" premiered on ABC on January 6, 2009 and concluded on May 6, 2009 and consists of 19 episodes.  The eighth season was the first to be shown on ABC after NBC dropped the series, ending its seven-year run on the network.  ABC's pick-up of the show was followed by it commissioning nineteen episodes, which included an hour-long finale.  For all of the season's run, it was expected that the eighth season would be the last, especially after the show's creator Bill Lawrence announced it.  After rumors surfaced of a ninth season, it was understood that the eighth would be the last to star Zach Braff and much of the main cast.  However, the show was later re-commissioned for another season, in which Braff and other cast members appeared for multiple episodes.  The eighth season was the first to air in high definition. The eighth season of the American television comedy "The Office" commenced airing on NBC in the United States on September 22, 2011, and concluded on May 10, 2012, consisting of 24 episodes.  The series is an American adaptation of the British comedy series of the same name, and is presented in a mockumentary format, portraying the daily lives of office employees in the Scranton, Pennsylvania branch of the fictitious Dunder Mifflin Paper Company.  The eighth season of "The Office" aired on Thursdays at 9:00 p.m. (Eastern) in the United States as part of the "Comedy Night Done Right" television block.  This was the first season without Steve Carell as Michael Scott in the lead role and the only one to not feature the character in any capacity. "Brian Griffin's House of Payne" is the 15th episode of the eighth season of the animated comedy series "Family Guy".  It originally aired on Fox in the United States on March 28, 2010.  The episode features Brian after he discovers an old script he had written that Stewie found in the basement, and subsequently pitches the show to television executives.  The show is quickly and dramatically altered by the executives and James Woods, however, much to Brian's frustration, who nevertheless attempts to adapt to the new format.  Meanwhile, Chris and Meg attempt to hide the fact that Stewie is unconscious, after they accidentally bump him down a flight of stairs. "Free Family Portrait Studio" is the twenty-fourth episode and season finale of the eighth season of the American comedy television series "The Office", and the show's 176th episode overall.  The episode originally aired on NBC on May 10, 2012.  "Free Family Portrait Studio" was written and directed by B. J. Novak, who also wrote and directed the season premiere "The List".  The episode guest stars Andy Buckley, Jack Coleman, Sendhil Ramamurthy, Jerry Minor, and Michael Schur.
Answer: How I Met Your Mother