Or, more generally, scam baiting. There's some good laughs here:
http://www.419eater.com/
My favourite one (well, the only one I've read, and only because the title was "church of the holy cow", was
http://www.419eater.com/html/moses_hand.htm
(http://homepage.ntlworld.com/mike.jb/images/moses_hand5.jpg)
lmao@faking it :)