Who's The Most Obnoxious Fictional Teenager Of All Time?

It's hard to be a teenager. Everybody wants to shape you in their own image, other kids are horrible, and your hormones are running out of control. So it's only fair that fiction reflects the turbulence of adolesence — but sometimes, it goes too far. Who's the most aggravating adolescent in science fiction or fantasy?

Please include picture, book cover, comics panel or clip of this annoying teenager. And please mention his/her name, where he/she appears, and why they're irksome. Thanks!

Top image: Harry Potter. The teenager who discovered how to talk with a capslock, a power that should be reserved for Terry Pratchett's Death.