So once I thought of the villain with a sense of humor, I began to think of a name and the name "the Joker" immediately came to mind. There was the association with the Joker in the deck of cards, and I probably yelled literally, 'Eureka!' because I knew I had the name and the image at the same time.

This quote is referring to the process of how the fictional character, The Joker, was created. The person writing the quote first thought of the idea for a villain that had a sense of humor. They then began to think of a name for the character. Immediately, the name “The Joker” came to mind as it is associated with the playing card from a deck of cards. The person was so happy with this idea that they shouted a “Eureka!” which is a way of expressing one’s joy and satisfaction at finding the answer to a problem. This meant that the person had both the name and the image for their character in the same moment.