Have you ever played or seen someone play Portal: Prelude?



In the ending you were suppose to get the cake. You enter a room where the cake is really there, and everyone is cheering for you. But then there was a guy saying:



"Okay, I know we promised you cake, party and all..."



And they tell you that they are going to activated Glados for the very first time, and don't want you to miss it. So you don't get the cake just yet. And when all that is done, there were other problems, and in the end you still don't get the cake.