This question on where the magnifying glass for search came fromquestion on where the magnifying glass for search came from also fits this category I believe, and is not closed but actually rather popular with many useful responses.
Incidentally, I found it not by looking for another example here, but by Googling for 'magnifying glass for search'.
As @Izhaki alludes to, if we can discover how and why something came about, and the reasons for the thing at its inception are no longer an issue, then perhaps we should rethink whether the thing remains the best solution.
