Jeffrey Jones, best known as Ferris Bueller's high-school principal, has been accused of failing to register as a sex offender. The 57-year-old actor pleaded no contest last July to a felony charge of hiring a 14-year-old boy to pose for sexually explicit photos. He was sentenced to five years' probation and ordered to register as a sex offender. Jones reportedly registered last year but moved in March and failed to register again.