Who Knows?

"Who knows?'
"I know."
"Oh shut up, Herman. You don't know."
"Maybe. But who?"
"I'm sure I don't know."
"I don't either."
"Neither do I."
"That's the way it is. Nobody knows!"
"What shall we do? How shall we proceed, if nobody knows?"
"I don't exactly know."
"Oh my God, my God, nobody knows!"
"Nobody?"
"Nobody."
"Nobody knows."