Years ago I tried selling a laptop on eBay. The "winner" ended up being someone trying to scam me by having me ship before paying or something, I don't completely remember.

Anyway, the worst part is that eBay collected the listing fees before the auction was handed over to the fraud dept. I got my fees refunded, but in the form of credit. So now every month, for the past 10 years or so, I get a e-mail from eBay reminding me of my current account balance of -$26 and change.