The obnoxious ticket giver who's job it is to make young people, esp. college student's lifes a liveing hell. Often found hulking over parking meters like vultures or in shopping mall parking lots watching to make sure that you're actually going into the mall after parking your car there.
"There's the parking nazis makeing sure I'm actually shopping here today."
An Operateing System that's great for running network servers, but despite it being increadable stable, you have to be a Guru to make it work.
Also when it does crash, and yes it does occasionally, it does a spectacular crash.
Every OS has it's place in the world of computing:
Windows - Gameing/Network Clients/Home Users
Linux/Unix - Servers
MacOS - Multimedia and Special Effects
Not that they're limited to these roles, it's just that's where they best perform.