Why is it that people feel the need to press the button, repeatedly, at a pedestrian crossing when the fact that WAIT is lit is testament to the fact that someone has already pushed it. It's the same when you're waiting for a lift. You press the button to call the lift and then someone else will come along and press it three or four times in quick succession.
Why do they do that? Do they really think that the lights will change/lift will arrive any sooner because of their action? Why can't everyone just be patient and let things happen in their own time?