There's Nobody There

No matter how much paranormal mischief went on, there was always something inherently depressing about 'Nobody's House' (1976), a comedy about the ghost of a Victorian pauper child (who didn't even have a name) and his fun and games with a contemporary family.

Great music (by Anthony Isaac, who worked on 'Survivors' and, later, 'Supergran'), but these are unsettling credits, particularly the spectral outline disappearing into eternity.