I very rudely ask for the cookie and you don't give it to me.
I then say that I'm sorry for being so rude and you feel bad for me and give me the cookie.
I bring up the fact that the character from your avatar has disappeared, leaving behind only the background. As you're busy trying to fit in with everyone else I take the cookie.
I distract you with my amazing abbility to juggle 37 bowling balls at the same time while my pet ninja-tiger sneaks up behind you to enject poison into your neck.
I replace Shadow's sunglasses with a nuclear bomb, and because he's your shadow, you blow up too.
I RUN AWAY FROM THE RADIOACTIVITY AND CLAIM THE COOTIE!