Sandcastles in the Sand (21 Apr. Barney and Robin start out as friends, but he falls in love with her after they impulsively sleep together in "Sandcastles in the Sand". No, if I was your mom, I'd say, "We forbid you from seeing this boy!". Browse more videos. Robin and Barney's wedding was difficult for Ted fans to watch. (. [You're so rad.] They all do their best to console her, but are ultimately unsuccessful. They sit nervously on the couch before Barney asks "Should I just put it in?" When is Ted's birthday ? This story is told in the third person but it's from Robin's POV. Copy Link. For the song featured in this episode, see Sandcastles in the Sand (song). evil league of evil.