While Lily decorates his apartment, Marshall leaves for the law library to finish one last paper that is due that day.
At the bar, Ted is telling Robin and a progressively ill Barney about what happened, and realizes that he has to apologize to Lily.
He tricks her into thinking he is the pizza delivery guy so he is able to get her to open the door to her tiny, crappy, cramped NY apartment.
Ted then tells Lily that she can take the decorations back to his and Marshall's apartment because he is going to visit Stacy's family in Staten Island.
He whines about wearing sweatpants, not getting ice cream for dinner, and everything else he can until Robin spikes his tea with codeine, making him fall asleep.
Marshall comes back home to the apartment, finding the winter wonderland intact and no knowledge of what happened earlier in the day.
Since she has no idea how Marshall knew about her preferred item, he admits learning about it from Ted, to whom Lily told her story back in college.