David Crystal writes about insults in English in his blog post On Insulting Brits. In it he mentions flyting, a type of contest based on insult exchange, and Shakespeare's work as sources of inspiration for unimaginative angry heated people. The Web facilitates this second task by providing lists of Shakespeare's expressions. These are some examples:
Shakespeare's insults sorted out by plays.
A Shakespearean Insulter presenting one sentence at a time.
Shakespearean Insults Generator produces new insults by combining Shakespeare's words and expressions at random.