22 And Ham, the father of Canaan, saw the nakedness of his father, and told his two brethren without.
23 And Shem and Japheth took a garment, and laid it upon both their shoulders, and went backward, and covered the nakedness of their father; and their faces were backward, and they saw not their father’s nakedness.
24 ¶ And Noah awoke from his wine, and knew what his younger son had done unto him.
Did Ham just see his father or did he do something to him? "and knew what his younger son had done unto him." I have seen it suggested that he mutilated his father.