What's the best thing a customer has ever said about your product, and how did you actually get it?

Almost every founder I know has one line from a customer that's better than anything they'd have written themselves. Usually it's the oddly specific one. The bit you'd never have thought to claim about your own product.

What I find interesting is how those actually arrive, because it's almost never the polite follow-up email asking for a testimonial. Mine turn up by accident. Someone says it in passing at the end of a call, or drops it into a support thread, and if you don't catch it right there it's gone for good.

The other thing I've noticed is that the people who say the best stuff are the ones who'd never fill in a form. The happiest customers tend to be the quietest ones, which feels backwards but seems to hold.

So I'm curious what everyone else is sitting on. What's the best thing a customer has said about your product, and what were you actually doing when it showed up? Did you ask for it, or did it just land in your lap?

And if you did ask, what did you say? I've still never found a version of that ask that doesn't feel slightly awkward.