Train asshole

So today I was in the train, sitting and reading quitely, and this guy in front of me suddenly told me: "You are an asshole". And, thanks to one of this rare and sudden explosions of wit inside my little brain, I replied: "You're right, I'm a complete asshole".
From that nice start, we had quite a nice chat. He works at HP. His name is Arnold (well, that's not his name, but he doesn't want his real name here -- cause you know, I told him that I was definitely going to publish this story... so let's call him Arnold)