Three of them soon open a bottle of vodka and proceed to get acquainted, then drunk, then noisy, singing and telling political jokes. The fourth one desperately tries to get some sleep; finally, frustrated, he surreptitiously leaves the room, goes downstairs, and asks the lady concierge to bring tea to Room 67 in ten minutes. Then he returns and joins the party. Five minutes later, he bends over an ashtray and says with utter nonchalance: “Comrade Major, some tea to Room 67, please.” In a few minutes, there’s a knock at the door, and in comes the lady concierge with a tea tray. The room falls silent; the party dies a sudden death, and the conspirator finally gets to sleep. The next morning he wakes up alone in the room. Surprised, he runs downstairs and asks the concierge where his neighbors had gone. “Oh, the KGB has arrested them!” she answers. “B-but… but what about me?” asks the guy in terror. “Oh, well, they decided to let you go. You made Comrade Major laugh a lot with your tea joke.”

(from Wikipedia)