Upon receipt of the diploma, the student handed over, and the transportation card left to himself. I decided to try today without a student.
I give the cashier a card and money.
I: For this month.
Q: Show the student.
I : I forgot.
K is no. I cannot do without a student. Give money and card.

Then he leaned closer to the glass, pointed to the card charging machine, blinked, and said - "And you are in the charging machine, he doesn't ask ;)";

More such cashiers.