The very nature of Banquo's death makes Macbeth seem profoundly nefarious. He decides to kill Banquo alone, without consulting anyone and without being convinced by Lady Macbeth as with Duncan. Furthermore, his reasoning for killing Banquo is vague and questionable unlike Duncan. The witches “greeted [Banquo] the father of a line of kings… [while on his] head they placed a fruitless crown” (3.1.61-2). Banquo will pose a threat to Macbeth one day, but he is in no way an immediate problem. Macbeth's killing of Banquo is a calculated move by an evil character as he arranges the death of a friend without consultation over a problem that probably could have been solved in the future. This is Macbeth's first solitary evil act done without the promise of any immediate gain. However, after Macbeth knows that Banquo was murdered at his command, he still cannot enjoy his role as king and begins to see Banquo's ghost. Macbeth continually makes himself ridiculous in front of his peers by repeatedly mentioning the presence of Banquo's ghosts and behaving abnormally. Lady Macbeth then has to cover it up by saying that Macbeth "is often thus, and has been from his youth" (3.4.53-54), asking the men to "think of [his actions]...but as a thing of custom " (3.4.97-98). This can be interpreted as Macbeth experimenting with his morality and therefore feeling guilty for his crimes. His guilt manifests itself physically in the