Wuthering Heights, with Laurence Olivier *swoon* (saw it six times!). Merle Oberon as Cathy was, enh, OK.

Pride and Prejudice, ditto. Greer Garson as Eliza, ditto.

Somewhere I recall reading that Olivier had been the first choice to play opposite Garbo in Queen Christina, but she insisted on having John Gilbert. Now *there* was an opportunity lost....