Two Chicks and the Public Toilet.

My guy friend at the office and I were talking about the new intern who had just started working in our floor. "Have you met her yet?" I asked him. "Nope," he answered.
The intern was a girl in her twenties, and she appeared to be a bit snobbish. So I proceeded to tell this guy friend of mine about my first conversation with the girl, which happened in the female restroom.
"I've only talked to her once," I told him. "I was in the female restroom and in came the intern. She didn't even say hi to me. All she did was fix her scarf at the mirror, and hey, she could have at least pretended to be interested in making friends..." I stopped talking because by now, I had realised that this guy friend of mine seemed to be drifting off and not listening to a word I was saying.
"Oi," I said to him. "Are you listening to me?"
He snapped  back to reality. "Oh, sorry," he said apologetically. "All I heard was 'you', 'intern' and 'female restroom'. And then my mind kind of drifted off someplace else."

Lesson: Apparently boys have evolved into developing skills of listening to only what they wanted to hear. Clever trick, I must say.