I'm grumpy because I ordered a desk lamp from an Amazon vendor and the stupid prats sent me the wrong one.
The one they sent is worth twice the price they've charged but it's too big to fit the little bit of desk space next to my keyboard, and so I don't want it.
Also, it's an ugly piece of tat and so I don't want it anywhere else in my home.
This means I have to argue with a demonstrably incompetent vendor about who pays for the return postage.
On top of that, the Distance Selling Regulations don't oblige them to pay for recorded delivery, but if I don't pay for recorded delivery then they'll doubtless say that they never received it, so I'll be out of pocket whatever happens, just for attempting to do business with people who are careless.
That's my story. Now tell us, why are you grumpy?