Robin thinks Barney is cheating on her, but learns he’s actually getting “Robin 101″ classes from Ted. Marshall tries to give away his barrel, Mabel, by leaving it on the sidewalk, but is miffed that no one seems interested.
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Ted realizes his blind date is the same girl he had a blind date with seven years prior, and they use the opportunity to try to learn what they do wrong on first dates. Meanwhile, Barney and Marshall discover a Lily look-alike at a strip club—the “third doppelgänger” for a member of the gang they’ve [...]

The rest of the gang uncovers Barney and Robin’s clandestine romance. Ted fights his nerves over his impending teaching debut at Columbia.
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