"Thou art a boil, a plague sore, an embossed carbuncle in my corrupted blood."

Show them how truly pissed off you are, in iambic pentameter.

Shakespeare's most vitriolic insults:

http://www.huffingtonpost.com/2011/07/17/shakespeare-insults_n_900193.html#s309660&title=You_should_be

No wonder the Poms were so appalled by John McEnroe. They hadn't heard anything like his infamous "YOU CAN'T BE SERIOUS, MAN" rant since 1616.