Nick: Hi Charlie. Thanks for yesterday. It was nice to see you
Charles: Hi Nick. So nice indeed. Come back whenever you want. How was your trip back?
Nick: good good. Except the journey in the metro.
Charles: What's happened?
Nick: we had a control in the subway.  Almost a face control!
Charles: are you kidding?  what have you done?
Nick: nothing special.  We bought our reduced  tickets at the  machine, and then the controllers stopped us  like thieves.
Charles: did you cheat?
Nick: of course not! we had our discount family card. But the red one, not  the blue one!
Charles: and so what...red or blue, it's a discount card, isn't it?
Nick: yes but the discount is not the same. With the red one the reduction is for train, only the blue one gives you discount on subway!
Charles: didn't know that.
Nick: me neither, and when i tried to explain it, i've been consider like a thieve.
Charles: did you get a fine?
Nick: yes! quite expensive. Next time i'll book a cab.
Charles: next time i'll come and pick you up!!
Nick had a control in the subway when coming back from Charles yesterday. Since he had the discount card only for train, he got a fine.