Note that if you haven't played Portal, go get it, play it, and come back in a few hours to finish reading this post. Otherwise, it probably won't be amusing. (You have been warned. ;) I just found out about this. I can hear her now: "You ate your only friend. That's why nobody likes you. You're such a horrible person."
I hereby declare that I have beaten Portal, and can now officially make all the cake jokes that the rest of the internet got tired of months ago.