Table: playboy_models_4
Columns: date
cover_model
centerfold_model
interview_subject
20_questions
pictorials

Question: Who played 20 questions during the issue in which Pamela Horton is on the cover?
SQL: SELECT "20_questions" FROM playboy_models_4 WHERE "cover_model" = 'Pamela Horton'

Question: What date did Dax Shepard play 20 questions?
SQL: SELECT "date" FROM playboy_models_4 WHERE "20_questions" = 'Dax Shepard'

Question: Who was the centerfold model when Krysten Ritter played 20 questions?
SQL: SELECT "centerfold_model" FROM playboy_models_4 WHERE "20_questions" = 'Krysten Ritter'

Question: Who was the centerfold model when Meghan McCain played 20 questions?
SQL: SELECT "centerfold_model" FROM playboy_models_4 WHERE "20_questions" = 'Meghan McCain'