The Nanny - Season 3 Episode 20 : Where's the Pearls? 1999

Mr. Sheffield has Elizabeth Taylor over, and like with all celebrities, Fran can't control herself until she meets her. A very friendly Elizabeth asks Fran to take her black pearls necklace to a courier, but of course Fran has to do it in her own way. She takes a cab, and accidentally bumps her head against the window when the driver misses a red light. She is taken to the hospital and wakes up with amnesia. She thinks she's Mrs. Sheffield, and after her she remembers what happened she finds herself in a lot of trouble when she realizes she lost Elizabeth Taylor's pearls.