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After Marshall's attractive female colleague kisses him, Lily refuses to believe it, resulting in Marshall convincing Jenkins into telling Lily that it really happened. Meanwhile, Robin uncovers a drinking game which, apparently, is made up about her.
Marshall: (talking about Lily) I've got to make her jealous.
Barney: Well, that's easy! Here's the plan: Step one: Sleep with Jenkins. Step two: I sleep with Jenkins first. Step three: We do step two first. I'm gonna go get started on step two!