Instruction books that start with phrases like "Our warmest congratulations on your purchase of .....".
Congratulations are for achievements, academic success, achieving a fitness goal, significant life events, changing job, something you will look back on. Not for clicking a couple of buttons on a web page and having an amazon delivery person drop something mundane like a hand blender at your doorstep. Perhaps a small "well done" is in order if you sat without cutting your losses or shouting, for over an hour in the limbo-of-life state that you end up in between paying your money and your number coming on on the great-screen-of-hope in Argos. But other than that, you have bought a low cost item from a shop, congratulations is just stupid.