My father told. History of Soviet life.

I went to a cafe with friends. I decided to take 100 grams of cognac. Their five. They approach the “stand”.

The first ordered 100 grams of "black tail".

The bartender opens a new bottle, pouring into a measuring glass of cognac. It measures 100 ml. Stir into a glass.

This is repeated with each of the five. The last man sees that after the bartender measured 100 ml in the measuring container, there was another 2 cm of cognac left in the bottle.

Is it how?

“Somehow,” replied the bartender and removed the bottle from his eyes.