Afraid of clowns? Perhaps you suffer from coulrophobia. Smithsonian looks at the "History and Psychology of Clowns Being Scary". Above, serial killer clown John Wayne Gacy who famously told police, "You know… clowns can get away with murder."
David Pescovitz is Boing Boing's co-editor/managing partner. He's also a research director at Institute for the Future. On Instagram, he's @pesco.