More. See the reason I despise April Fools nowadays isn't because of the day itself... the problem is that the "pranks" aren't pranks any more, it is just people doing silly or stupid things for the lulz.
That was a proper "prank", if a simple one.
7/10. Got me for a split second as I was moving my cursor to highlight the text
Higher than that; it's wonderfully easy to fall for. Though maybe because I was just hoping such a thing would actually exist, temporarily, for major submission-causing events.