i find great amusement in man hole covers which have been put back at the wrong angle so that any street writing (eg double yellow lines) suddenly go at a differnet angle.

you probably don't have a clue what i'm on about. that's my fault, not yours, so don't worry.

anyway, here is a man hole cover in the middle of the pavement nowhere near any double yellows. maybe it means no parking very small cars (or helicopters) on this manhole.