how do i convince my mom to let me get halo 3 odst altho its rated M please help me?

[ROBERTO]

tell me how to convince her because i really whant that game please help me

 

[kyle]

everyones gonna get it even all my friends and i want to be able to talk about it with them. i dont want to be left out of the convorsation. its gonna be one of the biggest game to come out ever!