Unlimited Every-Flavored Beans:

Using Ron, you can discover Bertie Bott's Every-Flavored Beans in bookcases. Using this logic, this is how the trick works. First, enter a huge room with many bookcases (usually a study area.) Pick out the beans (or occasionally dungbombs) from them, and then exit the way you came. Enter once more, and you will be able to reap the beans again, even though you already did! This is an effective technique for gaining unlimited beans.