You’re memorable: One-of-a-kind functionality sets you apart and means that your users are more likely to not only remember you, but also come back to you in the future.
Interactivity is fun: We’ve all ran across a website with some sort of fun interactive element that has made us stop and play with it! It also helps the user's drive to continue exploring your website for more fun functionality.
Users will share: Word of mouth is still one of the strongest ways to market your company. A site with a fun and intriguing element is something that users are more likely to share with their friends.