So there I was on the train to London and an attractive blonde girl opened the toilet door just as I was passing on the way to the buffet car.
I waited in the corridor and she said: "Sorry, I just wanted to check my hair in the mirror."
"No problem," I replied. "You're allowed to do that."
She promptly returned to her seat, satisfied that she looked presentable for the arrival into London.
As I was queuing to get off 10 minutes later, I saw the blonde girl in front of me: "I think your hair looks lovely by the way, " I told her with a friendly smile.
It was only when she looked at me in a funny way and didn't answer that I realised it was a different blonde girl I'd never spoken to in my life.