Might as well start a list.
Requirements:
1. Must be very common (lots of people effected)
2. Must be bad at what it was designed to do (AV that doesn't, etc)
3. Must be misunderstood (users should have the impression that it's good)
4. Must effect the computers general operation (running at machine startup is almost required)
5. Cannot actually be nothing but a Virus/Malware (must attempt to actually do something useful)
Requirements:
1. Must be very common (lots of people effected)
2. Must be bad at what it was designed to do (AV that doesn't, etc)
3. Must be misunderstood (users should have the impression that it's good)
4. Must effect the computers general operation (running at machine startup is almost required)
5. Cannot actually be nothing but a Virus/Malware (must attempt to actually do something useful)