The Cake

Origin
The Cake was known as a prize for completing all of the test chambers in the Aperture Science Enrichment



Center. During the test, GLaDOS proposed the Cake as a reward for completing the test, along with a party celebrating your accomplishment. As Chell explores the "behind-the-scenes" parts of the Aperture Science facility to escape the facility, GLaDOS tries to persuade her to turn around and return to the test chambers by telling her that she is running out of cake.

During Chell's confrontation with GLaDOS, she attempts to lower Chell's confidence by telling her that there was no cake or a party for her. One of GLaDOS's cores actually describes the ingredients to making the cake:

''"One 18.25 ounce package chocolate cake mix. One can prepared coconut pecan frosting. Three slash four cup vegetable oil. Four large eggs. One cup semi-sweet chocolate chips. Three slash four cups butter or margarine. one and two third cups granulated sugar. Two cups all purpose flower Fish shaped crackers. Fish shaped candies. Fish shaped solid waste, Fish shaped dirt. Fish shaped ethyl benzene. Pull and peel licorice.. Fish shaped organic compounds and sediment shaped sediment. Candy coated peanut butter pieces, Shaped like fish. One cup lemon juice. Alpha resins. Unsaturated polyester resin. Fiberglass surface resins. And volatile malted milk impoundments. Nine large egg yolks. Twelve medium geosynthetic membranes. One cup granulated sugar. An entry called 'how to kill someone with your bare hands'. Two cups rhubarb, sliced. Two slash three cups granulated rhubarb. One tablespoon all-purpose rhubarb. One teaspoon grated orange rhubarb. Three tablespoons rhubarb, on fire. One large rhubarb. One cross borehole electro-magnetic imaging rhubarb. Two tablespoons rhubarb juice. Adjustable aluminum head positioner. Slaughter electric needle injector. cordless electric needle injector. Injector needle driver. Injector needle gun. Cranial caps. And it contains proven preservatives, deep penetration agents, and gas and odor control chemicals. That will deodorize and preserve putrid tissue."''

(http://heartofblacksheep.blogspot.com/2009/12/portal-cake-full-ingredient-listone.html)

After Chell defeats GLaDOS, there is a short cutscene showing even more of the "behind-the-scenes" areas of the facility, ending with showing the cake on a table in the middle of the room with the Aperture Science Weighted Companion Cube sitting on the floor right next to it.