But the universe wasn't really unfair, she thought, and her mouth quirked.

Guinan's mouth quirked quickly toward a smile and back again.

Vaughn's mouth quirked in what might have been a smile.

Alan's mouth quirked as he brought his glass up to sip.

Don looked back at him; Smith's mouth quirked in satisfaction.

His mouth quirked in something that could have been described as a smile.

His mouth almost quirked in a smile, and that's when I knew how upset he'd been.

The king's mouth quirked toward a smile, but he said nothing.

His mouth quirked upward in something that was not a smile.

Jean's mouth quirked a little, and she raised her eyebrows.