Macbeth
Lady Macbeth enters in scene ii. She has already made Duncan's guards drunk. Macbeth comes in with his hands covered in blood, carrying the knifes of the guards. He is very troubled. Lady Macbeth comforts him and tells him to wash his hands and cover the guards with blood, so it looks like they did it. But Macbeth is afraid, so Lady Macbeth does it instead.