After buying a much sought after bag, the seller being overseas, it arrived with much less postage on than paid. I requested a refund and she kicked off, eventually refunding but claiming I was blackmailing her (I did say that unless she refunded some of the postage I would have no choice but to leave negative feedback, just being honest in my book).
However, on review the bag didn't suit my lifestyle (pushing a buggy whilst holding a tote bag etc) so I kept it as new with the tags on and listed it.
It subsequently sold for the same price I paid and ....... has now got lost in the post. You couldn't make it up.