How I Met Your Mother Episode 7.09 Disaster Averted

To answer the question about the origin of the "Absolutely No Boogie Boarding" sign outside the bar, Ted tells the story of what happened during Hurricane Irene. Despite Ted's insistence that they need to evacuate, their plans get delayed and the gang is forced to stay in the city. During this time, Marshall is in limbo between health insurances, and is very paranoid he will injure himself insisting that Lily constantly be by his side to protect him, much to her annoyance. However, after the storm, Marshall is able to let go of his fears and boogie boards into the bar (hence the sign). In present day, Barney is determined to convince Marshall to free him from the ducky tie bet because Barney will be meeting Nora's parents. Barney tempts Marshall by offering him another slap for the slap bet, and Marshall agrees that he can stop wearing the tie for three more slaps. Later, Barney and Robin discuss how they shared a moment during the storm and that they're glad nothing happened, but this results in the two kissing.