"Él no puede diferenciar mierda de shinola"
In 1948, however, the product was still going strong. This ad uses a straightforward and familiar kind of humour. Son has taken the alarm clock to pieces and can't put it back together. An over-the-knee spanking ensues, in which position he finds himself obliged to contemplate father's dirty shoes at close quarters.
No doubt in the hope of distracting his father from the disagreeable matter in hand, the boy does not hesitate to draw attention to the offending footwear. To judge from the aback-taken look on father's face, the ploy may be working.
Clearly this is "a regular boy" who takes spankings in his stride.
Shinola seems to have been a fairly cheap and cheerful product. In contrast to some other ads of the era that were aimed at more upmarket suburbia (such as Ivory Bath Soap), there is no suggestion here that parental corporal punishment is anything other than a normal and acceptable part of family life.