As my classmate "ingenious trick" performed

When I was in school, in fourth grade, I had one very intelligent but not very obedient classmate named Vovka. We had the second shift, it was harsh winter. At last the fifth lesson was supposed to be a difficult math test. When painful wait for this terrible control everyone's nerves already were on edge, the wolf suddenly said:

I bet now the whole school will turn off the lights, and we all go home?

Vovkina words almost no one took seriously, but all agreed that it would be very cool. Then took three of the most common nail, two of them inserted in the socket by means of ordinary pliers, and then threw them on the third nail. The light really went out, and we all together went home.

The child, who performed this genius stunt, he studied in the fourth grade.

via factroom.ru