One of the pet London Underground hates that many of you mentioned a while back were Tube "Space Invaders". This covers arm rest fascists, guys who sit with their legs wide apart and generally people taking up too much space on the Tube. Thanks to The Kitten's Toe I found that in Berlin there are signs in trains trying to stop people from taking up too much space when reading their newspapers!
Luckily I haven't seen too many people who have a major problem with newspaper reading on the Tube, but it must be an issue in Berlin.
I'd be much happier with a sign that worked for guys with their legs spread apart and maybe the reverse psychology approach from this old Metro cartoon could work:
Typically the Japanese have got there before London with this and have little stickers on train windows:
There's a worrying similarity between that sign and the Metro cartoon in terms of the stance. So arms folded also seems to go hand in hand with legs wide apart.
I love the big exclamation mark and am not quite sure if it's really saying "Stop doing this" or "Warning men with over filled trousers are sitting opposite you". I certainly needed this sitting across from the guy below.
Either way, I'd love to see signs for less Space Invading on the London Underground and I'm sure I'm not alone in thinking this.