The message claims that Clarissa, incarcerated in a mental institution for killing her parents, died slowly and painfully at the hands of the government due to a bungled execution.
Thus, claims the message, every year at the anniversary of her death, Clarissa returns to cut and slowly kill those unwise individuals who have failed to send on the message quickly enough or to enough people. The message explains that, by passing it on, you can ensure that Clarissa will haunt and hurt someone else rather than you. And, in fact, if you pass on the message to ten people within ten minutes of reading it, good luck will befall you and you will have the best day of your life.