Jingle by Gen Alfred M Gruenther

Sometime, when you are feeling important,
Sometime, when your ego's in bloom,
Sometime, when you take it for granted,
You're the best qualified in the room;

Sometime when you feel that your going,
Would leave an unfillable hole,
Just follow this simple instruction,
And see how it humbles your soul.

Take a bucket and fill it with water,
Put your hand in it, up to the wrist
Pull it out, and the hole that's remaining
Is a measure of how you'll be missed

You may splash all you please when you enter
You can stir up the water galore
But stop and you'll find in a minute
That it looks quite the same as before

The moral in this quaint example
Is do just the best that you can
Be proud of yourself but remember
There is no indispensable man