At pedestrians crossing (except for zebras), there is this strange box with a big button on it. When pressed, it announces to the traffic system that you want to cross the road.
Stating the obvious, but it seems that this is necessary. A strangely high proportion of people seem to amble up to a crossing and wait there hoping that the signal will change; it may do (especially if someone else pushes the button), or it may not.
There are rumours that at some crossings, the button is merely a placebo; fair enough. But at the majority of the ones I know well enough (and I know quite a few that well), a button push is required for the little green man to show up.
Expecting someone else to push the little button is laziness taken to the ultimate extreme.
And whilst we’re talking about it, the little green man that lights up is supposed to mean something – when he is green, you can cross the road; when he is red, you don’t. And yes I’m well aware that he’s red more often than not.