You know, the one where a kid figured out how to refine thorium by reading the Golden Book of Chemistry and turned his mother's garden shed into a Superfund site.
The moral of the story is that even a stupid human being can be pretty smart. Particularly a sufficiently motivated stupid person.
Of course it also helps that intelligence comes in different flavors. Some people are good at spatial reasoning, others are good at verbal reasoning. But we often overlook social reasoning because it's not part of the traditional IQ tests. I think another reason that Social IQ testing hasn't caught on is that there is good reason to believe that social reasoning ability isn't fixed. Changes in attitude can strongly impair or enhance an individual's ability to process social information.
Which leads to the flip side of the stupid people being able to be smart: even smart people can be stupid, particularly in making social judgments.