the real joke:

Stalin is giving a big speech in Moscow, and suddenly someone in the crowd sneezes loudly.

Stalin looks at the audience, and says, "Who sneezed?"

Nobody confesses, so Stalin claps his hands. A platoon of men with automatic weapons barge in, drags the front row out in the hallway and shoots them.

"I will ask again - who sneezed?" Nobody confesses, so the process is repeated with the second row.

an old man in the third row decides to sacrifice himself for the younger comrades, stands up and bravely proclaims: "I sneezed, Comrade Stalin!".

Stalin looks at him sternly for a moment. "Bless you, comrade!". And he continues with the speech.