Usually when I'm on public transportation for a prolonged period of time and I want people to leave me alone, I read
The Encyclopedia of Serial Killers (which I borrowed from
cricketchild and MEANT to return but then she had bought another copy so it was too late).
Anyway. These solutions seem more versatile. Also, less subtle.
Yes, I Think You’re an Idiot, That’s why I’m Ignoring You! How to Murder a Complete Stranger and Get Away With It Coroner by Correspondence