Quote from Joey in The One with the Routine
Rachel: I'm sorry, I don't think that that was a romantic thing. Joey: Well, maybe. But, hey, I know how I can find out. It's a New Year's Eve party. So at midnight, I can kiss her. And if she kisses me back, great. If she says, "Dude, what the hell are you doing?" I can say, "It wasn't me, it was New Year's."