You know when ignoramuses think they understand something when really they haven't the foggiest?

Totally!

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Do you mean, like the blue-face that tried to write this question? Yea.

Like introducing conditional clauses unto a question but then omitting the question itself you mean?

I understand what you mean. What is it again,?

Sure. That happens all the time.

But it is possible for any of us to think that we understand something when we in fact do not. It doesn't always mean that someone is an ignoramus, generally speaking.