Question: What are the movies that are written and dircted by  john sullivan  with the airdate of 15january2009.
Schema: create table table_17641206_8 (directed_by varchar, written_by varchar, original_airdate varchar, PRIMARY KEY (directed_by))
SQL: select directed_by from table_17641206_8 where written_by = "john sullivan" and original_airdate = "15january2009"