What's the Kennection? #15

What 1986 movie, starring a young Jennifer Connelly and David Bowie as the Goblin King, was Jim Henson's last film?

What two metalworking implements are struck together in the famous "Gypsy chorus" from Verdi's opera Il Trovatore?

What (nonexistent, it turned out) features did astronomer Giovanni Schiaparelli "discover" on Mars in 1877?

What instrument did lead singer Don Henley play in the Eagles?

What four divisions of the brain include the frontal, parietal, temporal, and occipital?

What's the "Kennection"?