In 2006, Keith Slettedahl appeared in an episode of "How I Met Your Mother" that originally aired on which date ?
Best Prom Ever "Best Prom Ever" is the 20th episode in the first season of the television series "How I Met Your Mother". It originally aired in the United States on May 1, 2006. It had the lowest recorded viewership for season 1 (7.24 million).
Desperation Day "Desperation Day" is the 16th episode of the sixth season of the CBS sitcom "How I Met Your Mother" and the 128th episode overall. It aired on February 14, 2011.