My Back is HURT!!!!!

Yesterday is my friends birthday. It was so fun! We had a flour Fight, Eating together, playing X box, and more! (Plus, i get a cute doll, Angry bird.) But, the wind of disaster is facing me, when i chased my friend from running the house, I chased him. He is so so Baka*! When we finally caught him, suddenly I'm falling down! I just realize that the floor is so slippy, my back is so hurt! until now, its still hurt.. T.T And finally, i am suffering........ -,-