Spiked railings.
Not the ones that are actually used for genuine security purposes, I mean the kind that are about waist high and go around green areas in the city center, or the ones that surround parks, even though the parks gates can't be locked. What purpose do these things actually serve other than to be a hazard to people, either adults just taking a short-cut, or to children that just want somewhere nice to play.
They serve no real purpose, they don't even look nice.
and they kill people.
http://news.scotsman.com/edinburghmasonry/No-action-on-railings-that.3358488.jp
http://www.freerepublic.com/focus/news/2181882/posts
Some things are stupid.
