Blind Spots

Where is my blind spot?
If I know it, is it still my blind spot?
If I do have one, surely this question do not arise because that would make my question invalid - because I do not know what, when, and where of it.
The irony of unraveling as comically told by Ian McEwan's Solid Geometry - man, what have you done to your unfortunate wife!

Once a bloke told me he had lost some of his memories. I just had to laugh out loud.

Wind of Tao "Those who know do not speak, those who speak, do not know"