There were ten students about to take an exam on their laptops.
Five were wise.
The foolish students did not charge their laptops thenight before whereas the wise students’ laptops were at full power.
The students dozed off while waiting for the examiner to arrive and awakened to the sound of the bell ringing.
When the foolish students opened their laptops, they noticed that they were almost dead.
The foolish asked the wise to lend them their chargers, but the wise told them that they did not bring their chargers as theirs were already charged.
The wise students told the foolish that they should go find chargers because they needed their laptops. The foolish students left to go find chargers and while they were gone, the examiner arrived and shut the door and locked it because late students were no allowed in after the exam had begun.
The foolish returned and asked the examiner to open the door but the examiner refused saying that the rules did not allow them to do so.