I bet the people at Norton, McAfee, Kaspersky, Trend, and AVG are pulling their hairs out 1 by 1 looking at this thread. (Or, they're hearing the sweet sound of cash. Cha-ching! )
Oh well, you could always just make your own little "malicious" program. It doesn't even need to be malicious....as long as it's annoying as **** if all you're trying to do is annoy your sister.