03E16 - Sandcastles in the Sand

Robin is excited about seeing her first boyfriend, Simon, again, he who is coming into town for a visit. In reality, Robin wants to prove that she's done better than him since he dumped her ten years earlier. On paper, she knows she's done better, and even in person it is obvious to Robin's friends that she's done better, as he is just an older, balding version of his immature teen-aged self. But Robin comes down with a case of what Marshall calls revertigo: turning back into one's old self in the presence of friends from that era. Robin, not seeing what the others do, falls head over heels for Simon all over again. Beyond wanting to date Simon again, Robin gets another case of ten year old déjà vu. Meanwhile, the gang discuss and don't discuss Ted and Lily's cases of revertigo, Ted's in relation to his friend Punchy and Lily's in relation to her friend Michelle. And Barney makes it his mission to find Robin Sparkles' second music video which Robin had never mentioned previously even existed.