Life is full of such experiences.
Jesus lived through many of them, like the event we will witness today. See, your king comes to you, righteous and having salvation, gentle and riding on a donkey, on a colt, the foal of a donkey. It was a prophecy which everyone knew spoke of the Messiah, the great One who would set his people free, who would usher in God's glorious kingdom on earth. Now here was the fulfillment of that prophecy - God's annointed One, His representative. A new era is dawning.