Go back to class in time for Reading. Run a lot. Tell your Grandmother that you're allergic to chocolate, so she'll make her lemon cookies at every holiday and your birthday. Your aunt needs to know which He-Man figures you have already, so show her. Invite all your friends over to your big birthday party and spend the whole time crying in your bed, just because.
Parents love that.
The day after your birthday is the most diseased day of your life, don't go to school. Go play with your new stuff. When you toss your brother out of a moving car while helping a neighborhood friend with his paper route, lie. When your brother runs home screaming with an open back and and pounding headache, cry. And when your parents' eyes turn from looking at his blood in terror, to your tears in rage, run.