Sending you birthday wishes, from a stranger
I printed 13 birthday cards, all of them had one character of the word “Gefeliciteerd” on the front (“Gefeliciteerd” is the Dutch word for “Congratulations”).
I added the address of a friend (who was almost birthday), a poststamp and a small letter with the question if the person who finds the card could please post it before the birthday party of this friend. They were also asked to write down personal birthday wishes for him.
Three cards made it to the birthday party.