Of practical experience.

Policemen march all folks away
Who practise virtue every day--
Of course, I mean to say, you know,
What we call virtue here below.

For only scoundrels dare to do
What we consider just and true,
And only good men do, in fact,
What we should think a dirty act.

But strangest of these social twirls,
The girls are boys--the boys are girls!
The men are women, too--but then,
Per contra, women all are men.

To one who to tradition clings
This seems an awkward state of things,
But if to think it out you try,
It doesn't really signify.

With them, as surely as can be,
A sailor should be sick at sea,
And not a passenger may sail
Who cannot smoke right through a gale.

A soldier (save by rarest luck)
Is always shot for showing pluck
(That is, if others can be found