[Doc Faustus]

No.
You are on a train and a guy/girl sitting next to you keeps on laughing to himself, loudly, hysterically. He apologizes and tells you in graphic detail about this man/woman he has been meeting in a bar and having long nights of torrid and demeaning sex with. He shows you graphic pictures that reveal this person to be your significant. Not only is it funny to him that they've tricked the sexually inadequate loser this person's with, but it's even funnier because he has full blown AIDS. Kill him?