1 On that night could not the king sleep, and he commanded to bring the book of records of the chronicles; and they were read before the king.
While Haman is busy building massive gallows to kill Mordecai on, Ahasuerus is having a sleepless night. He had the only bedtime stories (the records of his reign as king) available to him brought in and read.
2 And it was found written, that Mordecai had told of Bigthana and Teresh, two of the king's chamberlains, the keepers of the door, who sought to lay hand on the king Ahasuerus.
Remember, Mordecai snitched on them and they were executed, saving the king's life.
3 And the king said, “What honor and dignity hath been done to Mordecai for this?” Then said the king's servants that ministered unto him, “There is nothing done for him.”
They kind of forgot to reward him for saving the king’s life.
4 And the king said, “Who is in the court?” Now Haman was come into the outward court of the king's house, to speak unto the king to hang Mordecai on the gallows that he had prepared for him.
He could hear or see that someone was waiting to talk to him. He could have just had them executed right then since he hadn’t called for anyone.
It was Haman wanting permission to kill the very man the king was just reading about saving his life.
5 And the king's servants said unto him, “Behold, Haman stands in the court.” And the king said, “Let him come in.”
6 So Haman came in. And the king said unto him, “What shall be done unto the man whom the king delights to honor?” Now Haman thought in his heart, “To whom would the king delight to do honor more than to myself?”
Before you ever jump to conclusions you really should find out what is going on. Haman, who is coming in in the middle of the conversation, assumes Ahasuerus wants to honor him. Who else could he possibly want to honor?
7 And Haman answered the king, “For the man whom the king delights to honor,
8 “Let the royal apparel be brought which the king used to wear, and the horse that the king rides upon, and the crown royal which is set upon his head:
“Bring out your older robes and your best horse and your crown….”
9 “And let this apparel and horse be delivered to the hand of one of the king's most noble princes, that they may array the man withal whom the king delights to honor, and bring him on horseback through the street of the city, and proclaim before him, ‘Thus shall it be done to the man whom the king delights to honor.’”
“…and hold a parade for him!”
10 Then the king said to Haman, “Make haste, and take the apparel and the horse, as thou hast said, and do even so to Mordecai the Jew, that sits at the king's gate: let nothing fail of all that thou hast spoken.”
Ahasuerus liked the idea.
Here Haman came to have Mordecai killed in grand fashion and now he has to lead a parade for him!
11 Then took Haman the apparel and the horse, and arrayed Mordecai, and brought him on horseback through the street of the city, and proclaimed before him, “Thus shall it be done unto the man whom the king delights to honor.”
12 And Mordecai came again to the king's gate. But Haman hasted to his house mourning, and having his head covered.
Haman was upset and embarrassed. Mordecai just went back to work.
13 And Haman told Zeresh his wife and all his friends everything that had befallen him. Then said his wise men and Zeresh his wife unto him, “If Mordecai be of the seed of the Jews, before whom thou hast begun to fall, thou shalt not prevail against him, but shalt surely fall before him.”
Haman’s counselors saw what was coming. They knew enough legends, if not actual history, of the Jews to realize that Haman was not likely to win this one.
Too bad they didn’t realize this earlier. They might have counseled him earlier to get over his anger and spared his life.
14 And while they were yet talking with him, came the king's chamberlains, and hasted to bring Haman unto the banquet that Esther had prepared.