A substitute for "The writing is on the wall'. From the (video game) Portal. The graffiti in background levels give clues and point out truths including "the cake is a lie".
Chell is promised cake and grief counseling as her reward if she manages to complete all the test chambers. After Chell completes the final test chamber, GLaDOS congratulates her but the promised cake is a lie.
by Portal player July 20, 2008