The Czar decided to make a tour of Russia, and he expected every city he visited to express its loyalty and to joyously celebrate his visit. He visited the cosmopolitan St. Petersburg, and they feted him in an exuberant and amazing fashion. In Moscow, too, there was tremendous celebration, and while it didn't match St. Petersberg, it was in keeping with what they could imagine and do, and he was pleased. As he visited the smaller provincial towns, they, too, did the best they could, and he was satisfied. He decided he was going to visit some far off village in the hinterlands, but he knew the simple people just had enough to barely survive, and they barely knew who he was, and he couldn't expect much from them at all.
There was someone in the town that did, however, know what was about to happen- he had lived in the big city, and he knew who the Czar was, and worse, he knew the local custom. The local custom was that whenever a stranger would come to town, they would throw stones at him. So this man begged the townspeople, look, you have no idea who it is that is coming, and you can't even imagine the honor that he is due. All I ask you is, please don't throw stones at the Czar.
The Chafetz Chaim said that on our madreiga, it's hard for us to have any inkling of what it means to come before Hashem on the Yamim Nora'im. At least let's try to not thrown stones.
I once said a similar thought, here. The idea was that the Mishna in Pirkei Avos 5