Wandering the streets, Serrin stopped on his way up the narrow one leading to the hilltop castle and gazed idly into the window of a confectionery shop. Some colorful little boxes caught his eye and he bought one, only to find a distressingly heart-shaped chocolate biscuit inside. Accompanying it was a tiny piece of paper, which said that these were "Student’s Kisses," sweets sent by one student to a potential sweetheart whose chaperone prevented any more direct expression of ardor.