There's a couple legendary ones on there where the guys have gotten the Nigerians to ship heavy boxes over to USA/UK/Canada and cost them hundreds of dollars in postal fees
http://www.thisamericanlife.org/radio-archives/episode/363/e...
That's why the memory of the episode stayed with me for so long- that show is from 2008.
One of my favourites: http://www.419eater.com/html/john_boko.htm