What does a crazy person do when no tin foil is available? Well, the answer is obvious. You imitate the daffy, bug-eyed fellow depicted in the above photo.
Even the craziest among us can figure out how to block mind-controlling telepathic vibrations directed our way by conspiratorial dark overlords. Occasionally I put a stovepipe (not a hat–a real stovepipe) on my delicate cranium, just in case.