If the aim is brevity why not combine this with Haiku poetry which was traditionally used to 'communicate a timeless message, often achieving a wistful, yearning and powerful insight through extreme brevity'

In modern Japan Haiku poems have been used to replace the impersonal and unhelpful Microsoft 'error' messages

Some of my favourites

Stay the patient course.
Of little worth is your ire.
The network is down.

Out of memory.
We wish to hold the whole sky,
But we never will.

You step in the stream,
But the water has moved on.
This page is not here.

Three things are certain:
Death, taxes and lost data.
Guess which has occurred

A crash reduces
Your expensive computer
To a simple stone.