 With no previous formal teaching experience and between jobs, Fredi Cameron (George Lopez) interviews for a vacant substitute teacher position at Carl Hayden High School.The principal (Jamie Lee Curtis) questions his job stability record, but eventually hires Cameron because of his Ph.D. and engineer credentials.After the interview, while in the school's parking lot, Lorenzo Santillan overrides Cameron's car temperature safety sensor for $20 to avoid a more costly repair job.