Coulrophobes take heed! You’re not scared of clowns because they’re inherently dark, or even because you caught a few minutes of Stephen King’s IT on television. In fact, you probably owe your fear of clowns to a fellow named Joseph Grimaldi, the “Homo erectus of clown evolution.” When this progenitor died in 1837, a young Charles Dickens “was charged with editing his memoirs.” The resulting portrait, relays Linda Rodriguez McRobbie, was what ultimately “water[ed] the seeds in popular imagination of the scary clown.”