First use of my library crate in the wild

While mindlessly browsing the github tabs of one of my library crates I looked at the dependency graph, and went to the Dependents tab. There I expected to just see a list of my other crates (they're all connected in one project), as it had been every time before, but my attention went instantly to 100% when I saw another GitHub profile picture. Someone else was actually using my code!

I quickly clicked the repo, got confused, thought they had added the dependency as a mistake, since I initially didn't see how my crate could possibly be useful to that app. So I went to browsing the implementation and no, it was a real use case I'd have never predicted.

I can't describe how unreasonably happy I was for the rest of that day.