The next day, a huge crowd assembled in Jerusalem for the Passover Feast. When they heard that Jesus was coming there for the festival, they took palm branches and went out to meet Him, loudly shouting to Him, "Hosanna! Blessed is He who comes in God's name. Blessed is the King of Israel!" But Jesus found a young donkey and sat on it, to fulfill what was written: "Don't be afraid people of Israel. Look, your King is coming, sitting on a donkey's colt."
At first, His disciples didn't get it at all. But after Jesus was glorified, they remembered all this and realized that everything had happened exactly as the Scriptures had said it would. Those in the crowd who had seen Jesus raise Lazarus from the dead, were talking about it incessantly. And as they kept recounting the story over and over, the excitement from the whole thing just spread like wildfire among the people.
And that's why the crowd was so huge and noisy that day. The whole town was so electrified with the news of Jesus' power and ability, that a kind of mania had set in among them. So when the Pharisees saw what was happening, they said to one another, "This thing is out of control! Look! The entire world has gone after Jesus!"
(John 12:12 - 19 - JITN)