As she walked down the front steps, a nagging thought troubled her.

She ignored the nagging thought, and turned to the small table beneath the window.

How can one be lost in music when faced with the nagging thought that there's always something else to listen to?

But there was one nagging thought that would not let go completely.

A nagging thought snapped into the front of her mind.

Out of the blue, a nagging thought crossed my mind.

Which brings me to a nagging thought: Does anybody buy this kind of art?

Some nagging thought remained with him for a long while after that.

With little success, he tried to force the nagging thoughts from his mind.

But, even then, the nagging thought in his mind would not go away.