Continuing the discussion from What smileys are supported?:
If you hop to the thread from which I continued this discussion, you will see that codinghorror posted a link to another meta.discourse.org thread that subsequently was deleted or no longer is accessible. The onebox embedded link in his post makes it appear as if the link is still valid.
While this may not be a bug, my expectation was that the thread would still be there. I wonder if it makes sense, upon the deletion of a thread (or post?) to find the posts that link to it and insert a comment in the one box that the link is invalid.