This one might need an explanation.

A couple of years ago, a tour bus containing musician Dave Matthews (and all related excrement) dumped the contents of its septic tank into the Chicago River and onto a boatload of tourists.

Given the popularity of Mr. Matthews, I wouldn't surprised if one of the 'tainted' tourists actually pulled off a sale of their garments; though I'm not sure human feces and urine are easily shipped via US mail.