Spot the not in the recent screen grab from a TV broadcast in South Africa for the recent elections:

If you are a bit slow, here is how that graph should have looked like (to be a fair, accurate mathematical representation of the data). Why? Because the y-axis of a chart must be constant for all data items on the x-axis so that they can be compared - which is the whole point of a graph. Otherwise it is not a graph but a story. Like the one you tell your kids just before an atomic bomb is being detonated - "Everything will be OK, I promise".