Those little annoying kids who just are out there to make your life difficult by asking obvious questions.
They also utilize the current stupid joke going around school to the point where it isn't funny anymore; a joke that everyone is saying, like that "Blue Punch Buggy!" thing from Lilo and Stitch.
They wear shirts that say things like "I sold my sister for video games!" hurhurhurhur!!11
They get on MySpace at school and think they rock for having a MySpace.
They question what you are looking at on the computer when they are too stupid to understand it themselves (see example)
For example, say you are carrying a project while riding the school bus. A school kid will ask you in a fake "you're stupid" tone, "Why are you carrying that posterboard?" You respond kindly, "it's my history project," when really you wanted to say, "Um, think about this, moron. We're going to school. In school, we do projects. Ooooh, weird," in a sarcastic tone.
Steph: *watching Para Para dance videos*
David*in a slow condesceding tone*: What are you looking at?
Steph: Dance videos. *turns screen away*
Steph: Why don't you mind your own dang business?