How I Met Your Mother
How I Met Your Mother (often abbreviated to HIMYM) is an American sitcom that originally aired on CBS from September 19, 2005, to March 31, 2014. The series follows the main character, Ted Mosby, and his group of friends in New York City's Manhattan. As a framing device, Ted, in the year 2030, recounts to his son and daughter the events that led him to meet their mother.
Paul Shaffer
In February 2013, he appeared in an episode of the sitcom "How I Met Your Mother" titled "P.S. I Love You", in which it is revealed that the character of Robin (Cobie Smulders) used to be obsessed with him. The letters "P.S." in the episode title refer to Paul Shaffer.