Who was in the three darts challenge that aired on 10 may 2010?
CREATE TABLE "table1_26733129_1" (
  "episode_number" real,
  "air_date" text,
  "guests" text,
  "three_darts_challenge" text,
  "musical_performance" text
);
SELECT "three_darts_challenge" FROM "table1_26733129_1" WHERE "air_date"='10 May 2010';