In further episodes of yelling at strangers on the train...

Dear creepy dude,

I was screaming at you because you were leaning WAY to close to two ladies in succession and trying to talk to them about what I what they were reading. If you had noticed the fact they were cringing away from you, or that they put there head phones back on immediately after every sentence, or the grimace of discomfort that they had on their face when you interrupted them, or just the basic fact that they were reading with headphones on might have alerted you to the fact that they did not want to talk to you or anyone else.

Now, you were clearly not globally dysfunctional. You had a laptop and a guitar and a suit and tie. There is clearly an environment in which you function. But on the train, in this town, don't creep on ladies, please. There are so many reasons not to, but I'm going to give you mine: it fills me with an uncomfortably intense desire to cave your balding head in. Truly, this kind of behavior fills me with a very unpleasant desire to do violence to you that I would really rather not experience.