"Hey, do you know about the thing?"
"What thing?"
"The thing nobody is supposed to know about."
"Probably not then. Why, what thing?"
"Oh nevermind, nobody is supposed to know."
"Wait, what thing?"
"Forget I mentioned it."
"OH the THING. Yea I know."
"You don't know."
"What thing again?"

Apparently, if you don't know about the thing, then everyone else does and nobody can tell you.