One of my clients, who have serious Joomla background complained recently, that on his brand new Joomla site when he clicked on one of menu items his browser raised the well known "Bad Certificate" error. The site obviously worked well, but for some reason the link to that inner page was created using the https:// prefix.
Obviously, he had no valid security certificate in place - as many sides does not have these days, but the menu entry being an inner, Joomla generated link he (and myself, for some... 5 minutes approx) was dazzled, what might happened?