What examples of sarcasm are in Macbeth?

Image and Irony are some examples of figurative devices on Macbeth, a playwright by William Shakespeare. In this line by a lady in Macbeth for example says: 'The raven himself is hoarse, the croaks the fatal entrance of Duncan' in which the Word raven suggests a sensation in fixing the hones of those people who had been enforced and Duncan is going to his fate.