When a couple is attending a sporting event and one has the T-shirt, Jersey and/or ball cap for the home team and the other has attire for the visiting team.
Joe and Nancy went to the Yankee-Mets ballgame. Joe was a hardcore Yankee fan and Nancy was a life-long Mets Fan. Unlike other fans (who fought all night) they got along. So I guess they're a Bi-Fan-Ual couple.
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