Painful, frightening or even traumatic memories can serve to teach a person to avoid certain situations or experiences.

Both had the same thought, the same frightening memory.

The face and burning eyes brought frightening memories from the edge of death and madness.

That might explain how it has been able to reach into my subconscious mind and extract a frightening memory from my childhood.

Barin smiled at them; he didn't want to be a frightening memory.

That would be such a frightening memory.

He also has a frightening and painful memory that reveals Robinson in human terms.

For anyone politically aware, those four names are frightening they dredge up frightening memories.

A rush of sour and frightening memories had seized him.

Young as he was, he had only vague but frightening memories of our war with the Red Ships.