There are many possibilities for the answer to this question, but it is most likely to appear in the plot of the novel Lord of the Rings. In the novel, because Gondor's magic laboratory was destroyed by evil forces, the Lord of the Rings fell into the hands of Solan. In order to find and destroy the Ring, brave sorcerers traveled to the towns of Middle-earth and used all kinds of magic and weapons to fight. Gandalf and his assistant, Bilbo Baggins, went to a small village called the Hobbit and fought a fierce battle with the local Dwarf Golden Boots. In this battle, Gandalf used a spell called the coffee pattern to distract the enemy's attention and strength. Therefore, whenever the enemy's attention or power was distracted, a cup of coffee would appear on the screen. This was a humorous and ironic way of expressing the weakening of the enemy's power and the fact that Gandalf's magic could protect the victory of the protagonists.