CREATE TABLE table_25344 ("Series #" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Prod. code" FLOAT)

Who wrote the episode titled 'Christmas'?
SELECT "Written by" FROM table_25344 WHERE "Title" = 'Christmas'
SELECT "Written by" FROM "table_25344" WHERE "Title" = 'Christmas'