While in Rome, I visited a Coffee shop.
Sitting there I watched somewhat different phenomenon.

A person comes and orders two cups of coffee. There was no one with him.
The waiter takes the order.
Serves a cup of coffee; goes to the opposite wall and pastes a paper on the wall.
The customer drank coffee. And paid for two coffees. He then leaves.

A couple enters and orders three cups of coffee.
Same way, the waiter smiles and serves two cups of coffee.
He then goes to the wall and pastes a paper on the wall.
The couple drank and paid for three coffee.

I went to the wall, to read what’s written on the paper…