So many years ago while I was in college learning to code and interning as a developer working on a javascript based image designer. We were learning event handlers in class and I was learning how to work with jQuery.

So I decided to build an event handlers to move objects by key press. I had an afternoon free and dont remember merging it to the codebase.

A few months later, something was pushed that took key press the event handler and the testers complained about losing the event handler I made.

End of the story, I added a feature that is still being used because I wanted to learn how to do something.