Table: colbert_report_episode
Columns: episode
the_w_rd
guest
introductory_phrase
original_airdate
production_code

Question: What was the inroductory phase for the episode with production code 4005?
SQL: SELECT "introductory_phrase" FROM colbert_report_episode WHERE "production_code" = 4005

Question: What was the inroductory phase for the episode with neil shubin as a guest?
SQL: SELECT "introductory_phrase" FROM colbert_report_episode WHERE "guest" = 'Neil Shubin'

Question: What was the inroductory phase for the episode that originally aired january 21?
SQL: SELECT "introductory_phrase" FROM colbert_report_episode WHERE "original_airdate" = 'January 21'