Case in point:
Open Source Advertising - 1H 2016 is a question that provides an answer template -- when you scroll to the bottom, there's a answer template waiting to be filled in.
In this case, the template is:
[![Tagline to show on mouseover]] : https://cdn.sstatic.net/img/ad-placeholder.png : http://clickthrough-url
Clicking "Submit Answer" without modifying the template gets you:
No way is that something that should ever happen. Perhaps adding a check on whether there's any output rendered from the Markdown after links have been resolved, or just compare the answer with the template?