On 1 September, 1991, Harry Potter purchased a large quantity of wizarding sweets from the Honeydukes Express during his first trip on the Hogwarts Express, including some Chocolate Frogs. Upon opening his first one, he discovered Dumbledore's card. This would serve as his first introduction to two things: the concept of moving portraits in the wizarding world and the identity of Dumbledore himself, who would soon become his headmaster and a close friend.