I hardly understand anything from your story. Only that you were bored and sticked a emoticon-faced drawing on your friend's back. What does "sth" mean?? Is it a new net abbreviation that I don't know of yet??

And the "..." at the end aren't that suggestive, you should post the rest of your story. Unless you like being asked by people what happened next. And besides, what could a teacher do to you because of kidding with your friend..?

I strongly reccomend you work on your English. Some people are getting annoyed when they don't understand what you wanna say. Or, like me, simply get annoyed of the bad grammar.

And putting up a title like "really useful" only to attract views or comments results into what just happened here. Criticism. Harsh criticism.
But I think I got your idea, so I am just going to play your game so you don't say I am not nice.

"*puts on a dramatic face, glittery eyes and flowery background*

Oooohh, and what happened next, dfg-sama?? @u@"

And I am done with my moment of sarcasm. I know I am mean, but it's just Sunday evening and I tend to get easier annoyed in this period of the week.
Plus, I told the truth. *smug humph* And my comment is getting weird, so I would rather not continue.

wow!la lab lab.....sth means something!and "..." it means u can guss wat it should be....!just it..!and i never said u r not nice!in fact i really llike u!and ok i will work on my english!and the pic is the same with emoution i drew and stiked on my friend's back!

wow that pic is kinda freaky

I notice that you use exclamation mark often in your sentences. Please don't do that. It makes it seem like you're yelling. And in some parts, it's grammatically incorrect. You don't put a full stop (.) next to an exclamation mark (!)