They tell such a story.

A professor of one of the capital universities, a young, but already deserving of a reputation for insightful and principled teaching, told the students on the eve of the exam.
The so-called students! There will be no exam on Saturday, it will be postponed for next week.
This is why? They were offended by those who were preparing. Those who were not prepared, of course, danced the jiga, and made a figure in their pocket, so as not to smooth up.
"Because on Saturday there will be a protest, an opposition rally, at which I, as a citizen and a progressive thinker, cannot fail to attend.
Well, he may not say it literally, but the meaning is understandable.
By the way, he added. - If I meet someone of you there completely by chance, he can count on the automate on the spot.

Well, and this means Saturday, the column of protesters, the clutching, the cloudy omon, all the things. And the professor, with a white band on his chest, a poster "Freedom to the Constituent Assembly" (or what they write in such cases, I am not in the subject), moves in a column of like-minded people. Suddenly I hear someone calling. He stopped, turned around, there was no one. Just intended to go further, and here there is a gap in the clutch, from there a hand appears, takes it for the shovel, and pulls it out for the clutch. The shields shut down, like water after stone, and as if the professor had just been there, and it was not.
He had already opened his mouth to shout out angrily, “What are you permitting yourself!” and attract attention, - look, there is a fighter in front of him, in full layout, in one hand a machine, in the other a check-in.
Professor, you have promised it!

* * * *
It is said that after this, the professor became even more intricate and principled, and the phrase "accounting with the machine" disappeared forever from his lexicon.