THE BOX by Anna Ryan is a flash fiction moment centered on a box which needs to remain locked at all times. The person in charge of guarding the box didn't check the lock this time, and the nagging thought drives the person crazy.
The suspense is pretty good, but the ending is a bit weak. Instead of horror, this seems more like dark humor. Anyone who has ever forgotten to turn something off at home, right before traveling, will most likely relate to this.