I was browsing around and came to this old post, which I have seen a few times before: How should I deal with an employee who has slept with my wife?
However, I happened to notice that such post is a Community Wiki (as well as all the answers there posted). Checking the edits history, I can see it was made a Community Wiki (by this 110 rep user) about 3 months after it was posted.
The user who made the post a Wiki seems unreachable (last seen on '13), but I still wonder why was this post turned into a Community Wiki?
I can see this was before the Stop using community wiki as a reputation denial mechanism Meta SE post, where converting posts to CW was easier and even prone to abuse. However I still wonder how a low-rep user can/could do this1, and most importantly why... perhaps some of our respected users who witnessed this event can shed some light here.
1 Another example, this time a 1 (?) rep user did the change as evidenced by this revisions.