Random scene from an unfinished romance

He whistled a melody, a random series of notes that reminded him of nothing. He was just feeling the need to whistle something.

"What is that song?" she said.

"Nothing," he said.

"No, I've heard it somewhere."

"It's just random notes, really."

"It was a sad song, but I can't remember the words."

"I'm in a good mood," he insisted.

"Then why are you whistling a sad song?"

"Didn't feel sad to me."

"What's wrong, honey? Whatever it is, we can work it out."

"How did we get here?"