Season 8 Episode 15 episode 15 How I Met Your Mother Season 8 Episode 15 "P.S. I Love You" Photos! 01.26.2013. @ 06:31 ShahbazMalik Check out these official photos for How I Met Your Mother, season 8 episode 15 "P.S. I Love You". Make sure to also check out the official guide for more spoilers! image gallery View: thumbs list Source : CBS The episode airs Monday, February 4th.