Good insults are as memorable as good poems, definitely more entertaining, and arguably good for relieving stress.  In Korea, there was an old lady who improved her restaurant business by insulting her customers.  The customers like being insulted so much, they came from far away just to get insulted by her.

Here is a particularly nice string of insults from Tim Bray.  Say them out loud to enjoy it fully:

"They are the offspring of dogs without genitals and maggots fed only on the excreta of diseased lizards."

"May Bolivian drug lords seize their only daughter as hostages in a tense geopolitical drama."

"May their next cruise-ship vacation remembered for the simultaneous outbreak of Norwalk Virus, an crunching encounter with an uncharted reef, and a record-breaking series of Nor’wester gales."

"May ruthless investment bankers place their retirement savings in airline shares."

"A green, crapulent, morbid, fulminating, metastasizing pox upon them!"

Bravo, Tim, Bravo!  I wish newspapers would print good insults like they do cartoons.  We are ignoring a large chunk of culture and history here you know.  If you have good insults, send them my way.  I'll try to print a collection of them once a week as Sunday Insults.