Table: barnyard_episodes
Columns: prod_no
title
written_by
directed_by
original_airdate

Question: Who directed the episode written by Dan Serafin and aired on July 23, 2008?
SQL: SELECT "directed_by" FROM barnyard_episodes WHERE "written_by" = 'dan serafin' AND "original_airdate" = 'july 23, 2008'

Question: What is the title of the episode originally aired on February 2, 2008?
SQL: SELECT "title" FROM barnyard_episodes WHERE "original_airdate" = 'february 2, 2008'