When she wishes that she and Ted had a wonderful love at first sight story like Lily and Marshall, Ted reluctantly counters that the story is not as great as it sounds and says that he met Lily at their freshman party; where they drunkenly made out the night before she met Marshall.
Lily recounts the event differently, saying Marshall introduced her to him the next day while he was desperately apologizing to his long-distance girlfriend Karen for kissing another girl.
Though Lily recalls kissing someone at the party, she cannot remember who the guy was while Ted insists it was him, much to her horror.
Marshall mollifies Lily, saying he saw her and Ted make out with different people at the party.
At their college reunion in 2020, Ted is approached by a woman who tells him that she was the one he made out with at the freshman party, proving Marshall was correct.