In Block 6 of Castlevania IV, you eventually come across a hallway where these chandeliers fall and try to crush you.

But, you'll notice that there's one archway that doesn't have one. Hit the ground there with your whip to reveal a secret staircase!

Where you'll find a ghost walking around with his ghost-dog

And if you kill off the dog

The Ghost will fall to his knees and begin to cry

Which is kind of sad, really.

But then you get to load up on powerups, which makes it OK.