Labyrinth: Welcome Home My Queen

Sarah finds a crystal in the shirt pocket that she wore 10 years earlier, in the labyrinth, when packing to move into her first apartment. When she pulls it out, she sees her past, The Goblin King, sitting there with his hand over his face tapping his foot with what seemed like a walking stick, she heard "I miss her, oh, what can I do to get back the night we danced?"
She was taken by surprise and the crystal dropped out of her hand.
What she did next was a surprise for not only Jareth, but as for herself also.