The blissful Anonymity of Carpooling?

I was travelling back the other day in my sister's best friend's car, because I had to go for a dramatics society rehearsal. I was travelling with my sister's two friends (one whose car it was and another friend), my sister and this guy- who was friends with my sister's best friend. I found out that he actually went to the same school as my sister though they didn't know each other very well. We spent the drive listening to songs and singing along, discussing music lessons and politics and work. As we were talking, my sister's best friend said to my sister, "Arsh* is very quiet, he refuses to talk- just like you!" At which point, I smartly asked- "Who is Arsh*?"

{Awkward silence, followed by laughter. Possibly slight coughing on his part?}

My response: "Well, its not like anybody introduced us!"

*name changed