We all know you can prove anything with graphs. Especially when the graphs are non-scientific. Or not even in any way accurate. At the moment there is a lovely set of bus shelter ads by the currency convertors Travelex which do exactly this. Unfortunately I am unable to find an offical version of this ad, so I’ll just have to post my version on trust.

The just here is that the left bar is Travelex rate for ‘100 dollars, the bar on the right is Marks & Sparks. The difference when you look at the figures provided is less that two dollars. But on the graphs it looks significantly larger. That is because the graph has
a) No key
b) no scale
c) an asterix by the side of it which notably says “Graph not to scale”.