Irony

Although simple in form, this poster is of course a cutting comment on the declining intellectual standards over the years - pointing out to us via the simplest of metrics how in a few short decades there has been a marked decline in the level of basic skills that can be expected of juveniles, even in Western democracies characterised by free universal education. Its message calls for action, pleads with us to instil those most fundamental of life skills into our youngsters.

Yes, I'm talking about the apostrophe, of course. But the cartoon is quite funny, too.