What is computer for?

Have you wonder what is a computer for?
Make it simple, a normal primary and secondary student user, what will you all do with computers?
Studies, online games, researches, projects, blogging, MSN, ****(Haha jkjk), Youtube and many many more. What do you do with the computer?
I cannot stand it anymore, thus here writing how a "clever" person "fully" make good use of the computer. No prize for guessing, my sister, younger sister to be exact.

The only things she use the computer was MSN and watch shows. OK that not wrong, why am I so angry?
ANGRY- 10% MSN, 90% watch shows. Relax la only shows,whats wrong? Next point-STUPID BLOODY IDOL SHOWS THAT WAS SHOWING IN A MACHINE CALLED THE TELEVISION. She also use the computer watching DVD and VCD when there is a Hi-5 set in the living room, her stupid way of computer usage wasted a lot of my computer using time, so long that I can even level up to level 120 if it was convect to me playing games.
Her watching habits- when there is a funny part she will laughstupidly and back, watch again, laugh again, back again, laugh again and that may end up she remembering the lyric and start laughing at herself when she say it. She also watch it in the television sometimes and then back again to watch the SAME part in the Internet. More stupid action, she once told me she had brought that show DVD and she again watching it from the Internet with the disc in her drawer.(Internet needs to load)

Due to my limited vocabs I cannot explain much more of her stupid act, but just think if you have a sister like mine wasting the electricity and YOUR time doing ONE stupid things, how would you feel.