Last year I entered a McDonalds and said "excuse me can you please give me a Big Mac" and the employee gave it to me but didn't ask for any money in return so I just walked away
When I was at the Vatican my grandma asked me to buy her a small pic of the Pope and it was 5€, so I told the merchant that I would pay him 2€ for it, and showed him 4 small pics hid as one and he seemed ok so I paid him. 4 for the price of 0'35