Government intercepting your thoughts? Radio waves penetrating your brain? The Worst Shop Ever has the solution for you, especially if you're lazy in addition to being paranoid. Their tin foil hat is the perfect accessory for your favorite conspiracy theorist, especially if such theorist can't be bothered to make their own.
The tin foil hat also has a crystal at the top. Not being a conspiracy theorist myself, I'm not really sure what it's for, but I'm sure you can e-mail the seller.