This piece on collecting the banknotes of tyrannical regimes makes for a fun read:

I have had fun and instruction from banknotes in my time. I remember, for example, when I changed $50 in Bolivia and had to return to my hotel for a container in which to carry away all the pesos (paying for a meal by counting out cash took some time)…Paraguayan banknotes portrayed only dictators, including the totalitarian Dr José Gaspar Rodríguez de Francia, the immensely fat Carlos Anonio López, who so loved his country that he owned half of it, and Francisco Solano López, who led his country in the most disastrous war of modern times, in which 95 per cent of the male population perished. He is considered a hero in Paraguay.