Which word describes something that is both pleasant and painful, like a fond memory of a happy time now gone?

George W. Bush and which of his presidential election opponents both went to Yale, graduating two years apart? Which U.S. state re-adopted its flag and seal in 1967, approving a Gilbert Stuart portrait of its namesake for the seal? Nelly Dean and Mr. Lockwood narrate the story of Heathcliff in which 1847 novel? Both parts of the 2004 pilot of which mysterious ABC drama were directed by co-creator J.J. Abrams? Both sides suffered more than 20,000 casualties at which battle fought July 1 to 3, 1863? Both sons of Methodist ministers, which two men were the Democratic presidential nominees in 1972 and 1984? Sophia Loren and her mother worked as extras in which 1951 Robert Taylor epic set during the reign of Nero? Susan Blakely and Jessica Lange both played which troubled Hollywood actress in 1980s films?