So, so many. But the most annoying was selling about 40 antique wax cylinder records for a fair price and finding I had a Belgium buyer, despite selecting UK only and making it clear in the description.
He persuaded me he’d pay for the courier and seemed like a decent old chap so I chucked in a pile of extra, empty cylinder boxes, packaged the whole lot as if they were Faberge eggs and foolishly posted them off.
They arrived with five smashed and this guy went absolutely radge. He also insisted the empty boxes I’d sent should have had records in them.
PayPal account frozen, money sucked out of my bank account, courier company insurance refusing to answer the phone.
Expensive, time-sucking error that one.