What is real knowledge?

That's a really good question.

Hmm...

Beats me.

I can’t remember off the top of my head.

I’ll get back to you on that.

I’ll double check and let you know.

It’s a mystery to me.

It’s beyond me.

I dunno.

I have no idea.

I haven’t a clue.

I haven’t the faintest idea.

How should I know?

Don’t ask me.

Who knows?

It’s anyone’s guess.

Your guess is as good as mine.

I haven't the foggest idea.

Don't ask me.

I don't know.

"Real knowledge is to know the extent of one's ignorance." ~Confucius