Knowing - or not!

A conversation in the Science base of LHS a few days ago, centred around the subject of "Is there anything that [a certain member of the Faculty] doesn't know?". I pointed out that it was impossible to know what we don't know because, as soon as we know what it is that we don't know, we no longer don't know it! Confused? The following work by R.D.Laing may (or not, as the case may be!!) help.

There is something I don't know,
That I am supposed to know.
I don't know what it is I don't know,
And yet am supposed to know,
And I feel stupid if I seem both not to know it,
And not know what it is I don't know!
Therefore, I pretend to know it.
This is nerve-wracking,
Since I don't know what I must pretend to know.

Therefore, I pretend to know everything!

I feel that you know what I am supposed to know,
But you can't tell me what it is
because you don't know that I don't know what it is.

You may know what I don't know,
But not that I don't know it, and can't tell you.
So you will have to tell me everything!