Robin tries to keep her younger sister from losing her virginity while on vacation in New York, which causes everyone to reminisce about their first times.
Barney asks Lily to paint a nude picture of him after finding her painting of Marshall. And Ted can't find an opportune time to fire his old boss, who now works for him but still keeps undermining his work.
Everybody misses the Super Bowl because of a funeral. Therefore, they all try to go 24 hours without finding out who won so that they can watch the game together on Monday night.
When Ted misses his important business trip to Chicago, he tries to trace his steps back to the original incident that triggered the series of events that made him miss the flight.
Ted tries to get rid of everything he received from other women at Robin's request, but getting rid of the stuff Robin received from other men won't be as easy. Meanwhile, Barney gets revenge on Lily for making him attend her terrible play.
Ted changes Barney's bachelor party plans for Marshall at the last minute, so that it won't just consist of gambling and cheap strippers. And Robin gets Lily an inappropriate shower party gift.
Barney becomes a contestant on "The Price Is Right" so that he can confront Bob Barker, because he believes that the game show host is his biological father.
Ted's still not ready to date months after his breakup with Robin. But when Robin returns to New York with an exotic new boyfriend, he decides it's time to finally do something adventurous.
Ted has a chance for a threesome with two women, but Barney and Lily try to sabotage it. Meanwhile, Robin's date also goes better than expected, if only she can find a razor.
Robin tries to date a guy with a child, even though she does not like or want children. Meanwhile, Ted finds it impossible to make it with a woman he knows that Barney slept with a year ago.
While everyone meets Ted's crazy new girlfriend, everyone recounts their stories of how they met everyone else--but the stories turn out to have several inconsistencies.
Ted discovers that a porn star is using his name. Marshall is wined and dined by a firm that defends polluters, and Lily's spending habits may force him to take the job.
The guys shatter Ted's impressions of his new girlfriend by telling him she talks too much. Ted responds by turning the tables on his friends, and they react by pointing out Ted's worst flaw.
Marshall warns Barney that the third slap in their "slap bet" will be coming on Thanksgiving night. Meanwhile, Ted and Robin sleep together on the night before Thanksgiving.