Everyone loves Apple. Or Google. Or TheWhatever.
But then...
Newscasters from across the globe release information that the son of the high-profile CEO of said company has been caught playing the original Donkey Kong arcade version—and everyone's having a crazy freak-out about it. (Don't ask.)
A lot of people then bail out of the stock because of the uproar which is likely to die away in a couple weeks... or days, given that the 24 hour news cycle is nuts.
This incident would be your "special situation." It's a blip in the radar that doesn't have anything to do with the actual valuation of an investment or its tangible future expectations.