The phone rings at KGB headquarters.
"Hello, is this KGB?"
"Yes. What do you want?"
"I'm calling to report my neighbour Yankel Rabinovitz as an enemy of the State. He is hiding undeclared diamonds in his firewood."
"This will be noted."
Next day, the KGB goons come over to Rabinovitz's house. They search the shed where the firewood is kept, break every piece of wood, find no diamonds, swear at Yankel Rabinovitz and leave.
The phone rings at Rabinovitz's house.
"Hello, Yankel! Did the KGB come?"
"Did they chop your firewood?"
"Yes, they did."
"Okay, now it's your turn to call. I need my vegetable patch ploughed."