Such a horrible possibility had never occurred to me before.

Suddenly a horrible possibility began to rise to the surface of her mind.

"There are all kinds of horrible possibilities," said the ambassador.

How every minute of waiting seemed to bring the horrible possibilities even closer.

She mentioned nothing of the sort, in fact, not even as a horrible possibility.

All that did was give the recipient a chance to panic at the many horrible possibilities.

Then another, even more horrible possibility occurred to her.

What had begun a few months earlier as a curious little game now held horrible possibilities.

Jon stiffened suddenly as a horrible possibility occurred to him.

He had no clue now as to what was going on, and his mind swarmed with horrible possibilities.