An idle thought: apart from the vulgarity, would there be any disadvantage to allowing advertising on banknotes, and might this note help government fund printing them? Advertisements could be restricted to a small, standard area, so as nobody could be in any doubt as to them corrupting the general recognition of the note, and the frequency with which such advertisements changed may even prevent fraud, by forcing fraudsters to change their designs regularly. I know that in many places (like Scotland and Hong Kong) private banks issue notes bearing their logos – so why not go all the way?