I vaguely remember one from a few years back that was even more obvious. 

The story was that some PHD from somewhere wrote a paper that completely debunked some 'official science'. 

The fact check reported that the PHD "did not write his PHD thesis on this 'official science'". 
No one anywhere ever even suggested that he had or that the paper in question was his PHD thesis.

One sure clue is when they answer a question that nobody asked or that has nothing to do with the actual mater.