When opportunity presents itself...

My parents, bro n sis had entered Metro last morning n i was a little late getting in. My family has three metro cards and so I can get in alone.
I had walked quite a distance inside when, a guy asked me "R u alone?"
While I was a bit apprehensive about answering a dude about this, I said plainly "Uh.. Not really.. I'm here with my family"
He says, "Hmm.. Its for entering my wife actually.."
(Don't I need her permission for that?)
"Sorry, I've already come in so far, I can't let somebody else in right now", I said (Damn it! I blew a golden chance!)