I'm feeling physically sick.
I placed an order overseas for a move-coveted Christmas present and paid and obscene amount. The goods arrived and they're the wrong size. (Kind of my fault, kind of not). Worse still, the goods cannot be exchanged. My fault for not reading the small print. It's a company in the US and you can "re-sell" them on their website, so today I just spent another fortune shipping them back and listed them on the website.
I'm such a twat. Please tell me tales of stupid things you've done so I know I'm not the only one.