My best friend and I are at a party, everyone is drinking. we brought our wives along. (years ago when i was married)
His wife and my wife are the same height and weight with almost the same hair color. keep that in mind.
So i am perched on the edge of the kitchen table, and a friend of mine is standing on the other end of the room and we are talking and cutting up. My wife is standing in front of me a few paces listening to the conversation with her back turned to me facing the story teller across the way.
Part way through the story as he is finishing up his tale i get up while paying close attention to the ending of his story and walk up behind her, and take a sniff of her hair, i run my hands up her back and start rubbing on her shoulders and she is backing up to me and getting a little into it and i run my hands down her arms and onto her hips.
well about this time my wife walks into the room next to the guy telling the story and grabs a couple of drinks out of the refrigerator behind him.
my brain immediately goes "wait a minute... if you are over there, how am i..."
i announced with a shy laugh "oooops! wrong woman."
it was embarrassing as hell but when i pointed out my error everyone was dying of laughter, including my buddy and both of our spouses thankfully.