One of the insults Ichabod hurls at the online gamers who betrayed him is, "You shodden herring!" The earliest citation in the OED for "shodden" dates to 1829, and the latest dates to 1859. It is nearly certain that Ichabod would not have had any familiarity with it, as he was buried in 1781, almost fifty years before that initial citation, and the term fell out of common usage more than a century before he was resurrected.