Who directed the totle "tjockare än vatten"?
CREATE TABLE "table1_16384596_4" (
  "number_in_series" real,
  "broadcast_order" text,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_airdate" text,
  "production_code" real
);
SELECT "directed_by" FROM "table1_16384596_4" WHERE "title"='\"Tjockare än vatten\"';