This is genius
I once used to supplement my income by providing friends with a means to feel more comfortable talking to complete strangers. Anyway, one day I thoroughly defaced a fiver, making the Queen look like Groucho Marx, having the people on the back engaged in some sort of scat orgy, changing the issuing bank to the "Bank of Bumland" and several other choice additions.

Naturally I gave this to one of my customers in his change, which he only noticed when he had cause to make a paper tube. Much hilarity ensued. In the end the note got passed around six or more people in similar transactions, until one day one of my friends was in the local Spar and came to pay for his goods only to find that the only money he had was the purple-Sharpied Bumland note. Apparently he managed to convince the assistant that it was legal tender.

Sadly I don't know what happened to the fiver after that, although it would warm the cockles of my heart to find out.
(Eukanuba, Wed 22 Feb 2012, 11:35, Reply)