I've heard ebay being called an "online flea market." And I've seen a WIDE variety of things for sale that foster the flea market image.
Some things I have seen for sale (sorry, I don't have links):
An Xbox box
An Xbox 360 box
A kick in the butt
Buckshot that (allegedy) was what Dick Cheney shot that lawyer with (<= that was a Tonight Show feature

)
Weird. Stuff.