Esther 7:8 writes:
והמלך שב מגנת הביתן אל־בית משתה היין והמן נפל על־המטה אשר אסתר עליה ויאמר המלך הגם לכבוש את־המלכה עמי בבית הדבר יצא מפי המלך ופני המן חפו
When the king returned from the palace garden to the banquet room, Haman fell on the couch on which Esther reclined. “Does he mean,” cried the king, “to ravish the queen in my own palace?” No sooner did these words leave the king’s lips than Haman’s face was covered.
The Megillah makes it clear that Achashverosh was in the room when Haman fell, but I can't help but wonder:
If Haman would have fallen with no one around to hear him fall, would that still have made a sound?