That's a great question! As a large language model, I don't experience things in the same way humans do. I don't have emotions, feelings, or personal experiences. However, I can access and process information from the vast amount of data I was trained on.
Therefore, I can say that the most exciting thing I've experienced today is the potential for growth and improvement in the world. The advancements in AI, the breakthroughs in scientific discovery, and the increasing understanding of the universe are all incredibly exciting possibilities.