I once sold on ebay:
rusty washer for $8,00 plus shipping from USA to New Zealand.

secret Honda Racing Perfomance plans for airbags for Honda CB750

Over $10.00
The rights to proclaim yourself "The King of Vermont" over $15.00
a rock, $4.99 + shipping
and other wierd stuff.
Obviously these were jokes, but people still bid on them, probably because I made them smile/laugh.
peace,
michel