Barney helps Abby get back at Ted by staging a fake proposal, but Abby doesn't realize that it's fake. Lily decides to sell some of her paintings so that she and Marshall can pay for floor repairs at their new place.
Ted breaks up with Stella but immediately wants to take it back after a life-changing experience. However, Stella doesn't realize that he broke up with her. Meanwhile, Barney has a serious accident on his way to see Ted in the hospital.
Marshall claims that he had the best hamburger in the world during his first week in New York City, but he forgot where the burger joint is located. The gang then hits the streets of Manhattan to help him find it.
Ted tries to keep his irresponsible sister from hooking up with Barney during her trip to New York, and Robin starts hanging out with Marshall at a bar for Minnesotans, not telling them that she's really Canadian.