Today's Dose of Awesome: The Origin of the "Tin Foil Hat"

It occurred to me to wonder how foil came to be associated with paranoia and delusions (as indeed, it played a role in my own psychotic depressive episode).  So I looked it up on Wikipedia.  They have a short article about the foil hat meme, including the following sentence:

The effectiveness of tin foil hats is disputable,^{[citation needed]}

For. The. Win.