CREATE TABLE table_22124 ("No. in series" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Prod. code" FLOAT, "Viewers  ( millions ) " TEXT)

Who directed 'People who use people'?
SELECT "Directed by" FROM table_22124 WHERE "Title" = 'People Who Use People'
SELECT "Directed by" FROM "table_22124" WHERE "Title" = 'People Who Use People'