Adar I 13

Some time afterward, King Ahasuerus promoted Haman, son of Hammedatha the Agagite; he advanced him and seated him higher than any of his fellow officials. All the king's courtiers in the palace gate knelt and bowed low to Haman, for such was the king's order . . . but Mordecai would not kneel or bow low. . . . the king's courtiers . . . said to Mordecai, "Why do you disobey the king's order?" When they spoke to him day after day and he would not listen to them, they told Haman, in order to see whether Mordecai's resolve would prevail; for he had explained to them that he was a Jew. When Haman saw that Mordecai would not kneel or bow low to him, Haman was filled with rage. But he disdained to lay hands on Mordecai alone; having been told who Mordecai's people were, Haman plotted to do away with all the Jews . . . throughout the kingdom . . . Esther 3:1-6. The Writings--Kethubim: A new translation of The Holy Scriptures according to the Masoretic text, Third Section, The Jewish Publication Society of America, Philadelphia, 1982. Crayon on cardstock; edited on IrfanView.
As a Jew, Mordecai could not bow down to a descendant of Agaga, the Amalekite king. Jews do not bow down to other people, in general, because we answer to a higher power. To learn more about Haman, check out these links from the Bible and rabbinic literature.
The public reading of the Book of Esther is a raucous affair. Costumes and giddiness aside, each time Haman's name is read, the congregation attempts to drown it out with booing, hissing, stamping of feet, and the noise of graggers (noisemakers). Check out these Russian Haman Klopfers. Try this link to learn more than you ever wanted to know about
blotting out Haman's name.
This small gragger is part of my noisemaker collection.
2.75" x 3" x 0.75"