If you use the Chromium browser, you may have noticed an "Other Bookmarks" folder on the right side of the bookmarks toolbar. Have you ever tried to delete it? Guess what? You can't.
Neither can you move it, rename it, hide it, or otherwise make it vanish from your sight. If you think this is stupid, don't worry, you are not alone. It has been reported (here and here) but Google considers it a "feature" and refuses to change the behaviour. Lovely.