The cakes being pastires - croissant, pain au chocolat, pain aus raisens etc.
You don't realise until you get home, and the receipt shows you paid for 15, and you only wanted 15, but you had simply been given an extra four by mistake.
Bakery is ten minutes walk down as steep hill, and 15 minutes back up again.
Guests are due to arrive, and the table, cutlery, coffee etc still need to be put ready.
WWYD?