21. Alone With His Memories (Season 8, "The Time Travelers")
A rare late-season gem — the fact that everything here is supposed to have taken place five years prior might explain why it's so good. Marshall and Robin's custody fight over the Minnesota Tidal Wave cocktail is merely a memory as Ted sits alone at MacLaren's — everyone else is too busy for Robot vs. Wrestlers, by then one of their most important traditions. Figment Barney channels Nate's parting words to Claire on Six Feet Under when he tells Ted the moment is already gone. This maudlin scene takes on more significance when Future Ted wishes he had those extra 45 days between now and meeting the Mother to spend with her. It's the first suggestion, advanced in the episode "Vesuvius," that the Mother might be dead.