Mainly as sort of blueprints for dealing with most of the adults in their lives, to some extent with their fellows. It is this notion of aiming high and there's always hope, aim low and you might as well stop now.
Just as characteristic, perhaps, is the intellectual interdependence created through the development of the modern media of communication: post, telegraph, telephone, and popular press.
There is a lot of rubbish written about toilet humour - people saying it is childish and pretending it is beneath them - but there is no doubting the effectiveness of a really good willy gag.