(based quite closely on The Naming of Cats by TS Eliot, my favourite poet, and one of the greatest writers of English poetry)

The showing of slides is a family matter,
It just isn't something to do to a chum.
Let the family watch while grandmothers natter,
But don't show outsiders those views of your mum.

First of all, at a pinch, try them out on the daily,
But watch for the yawns - you don't want her to leave.
Are you sure your wife liked them? Did she smile, or sigh greyly?
It can cause more divorces than you would believe.

Matching programme to audience you must be particular;
Consider the person, consider the slide.
If your buildings all lean from a neat perpendicular
Can you really expect to keep friends on your side?

The pick of the bunch you may show to another;
If you have any doubts, leave the slides on the shelf,
And reserve them for one who's more close than a brother,
And will truly enjoy them - just view them yourself.