A man arrives at a hotel after a long train journey, exhausted. He comes into a communal room and sees three other guys who are drunk and talking loudly.

They are cracking anti-government jokes and laughing at Khrushchev. The man is annoyed that he can't sleep so he hatches a plan. He walks out into a corridor and asks a staff member to bring him a cup of tea. He then comes back into the room and starts talking to the noisy fellows:

"Comrades, you shouldn't joke like that here. Every room is bugged, you know..."

"Nonsense! Who would listen to us?" "Well, let me show you"

The man walks up to a socket and says into it: "Comrade major, can I have a cup of tea please?"

Sure enough, the staff member soon enters with a cup of tea.

"See, told you."

The three men are pale and quiet for the entire night, so the tired man finally gets some good sleep.

He wakes up the next morning alone. He walks downstairs and asks the receptionist about the fate of the three men.

"At 3 in the morning the KGB came and arrested them. Comrade major also said that he liked your little trick, but warned you to be careful next time."