Nickname for the blindfold

I wonder how many members know what blackguard means....
I don't mean to sound like I'm giving anyone the 'third degree', and I am being totally 'on the level' here.
In all areas, we are sometmes misled. Accidentally, and purposely. That is as near to a fact as most anything I can think of.

Blackguard

I take it that you mean sometimes things are not what they seem. This is true, but it is also true that sometimes things are exactly what they seem. The tricky bit is to work out which is which.