Sudoku

Will people please stop doing Sudoku puzzles on the chuff-chuff. I understand that train journies are as dull as an episode of Last Of The Summer Wine, but why not try reading a book, listen to music or something else more stimulating than writing some numbers down? I've seen people get their paper out, page directly to the puzzles, then put the paper away when they fuck it up. Try reading the goddamn paper, you might read something that you can talk about in the pub instead of your job. The guy next to me on the way home last night took the biscuit though; he used two different colour pens as well as a fluorescent pink highlighter. Anyway, everyone knows they are impossible.