n the sober light of day after Barney and Robin's romantic liaison, they have to decide if the night together meant anything beyond a roll in the sack. Regardless, they have to decide what to do about it with regard to their respective relationships with Nora and Kevin. Things are made more difficult when the four are supposed to be attending a social work function on a harbor cruise, which means that they are are captive together for the evening. Barney and Robin know that they have to be on the same page about what to do, but that may be easier said than done. Meanwhile, Ted has bought tickets to a groovapalooza concert for himself, Marshall and Lily. As is their regular concert routine, Ted also buys some weed for them to smoke at the concert. However, pregnant Lily doesn't think that either she or Marshall should get high in her state. When Marshall can't resist, he and Ted go on a stoned journey of discovery through the arena in search of some nachos for a hungry Lily. Their journey isn't quite what they imagine.

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