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...that GLaDOS', Turrets' and Caroline's voice actor, Ellen McLain, also voices the Administrator in Team Fortress 2 and the Overwatch in the Half-Life 2 series?
...that GLaDOS stands for Genetic Lifeform and Disk Operating System?
...that Ellen McLain is also an opera singer and sang the Turret Opera?
...that Valve employee Richard Lord was the original, placeholder voice for Wheatley?
...that Portal 2 originally wasn't going to have portals?
...that there were plans for "sticky gel" in Portal 2?
...that both Portal and Portal 2 derived many of their ideas from prototypes made by Digipen students?
...that the cake in Portal is a Black Forest cake that project lead Kim Swift chose at a nearby bakery?

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...that the cake is a lie?

...that The Underground is a Portal 2 fan series formerly produced by Machinima?

...that the cake is a Black Forest cake, a culinary specialty from south Germany?

...that Valve's webcomic Lab Rat explains Chell's survival?

...that Portal's main character was originally going to be male?

...that Portal 2's co-op mode was originally supposed to feature Chell and a second woman called Mel?

...that Rattman can be heard in Portal 2?

...that defective defective turrets may still be dangerous?[1]

...that Rattman hinted to be alive during Portal 2 outro?

...that Portal 2 concept missed Chell, GLaDOS and portals themselves?

...that Portal 2 take place several hundreds years after events of Portal from the words of Valve employee?

...that there's a third unidentified person in the background of the Caroline portrait?

...that the Portal 2 preview at E3 2010 showed a testing element called Pneumatic Diversity Vent that didn't make it to the game's final version?

...that there is an interactive trailer for Super 8 in Portal 2?

...that GLaDOS was intended to speak voice lines of Announcer in first chapter of Portal 2?

...that Ellen McLain favors GLaDOS over all other characters she has portrayed in Valve games?

...that the Hover Turret was going to be a personality core-based turret?

...that the Portal 2 was originally going to be a Prequel, with no Chell, GLaDOS, or portals?

...that the Animal King Turret was planned to marry off one of its Turret's to Chell? [2]

...that there were also plans for "Reflection Gel" in Portal 2?

...that Chell would originally talk in the ending sequence?

...that all Test Chambers of the Portal 2 Sixense MotionPack DLC were created by only two guys, Danny Woodall and Chip Sbrogna? [3]

...that Ellen McLain wrote a song to be used as an easter egg in Portal 2, known simply as "GLaDOS' Song"? [4]

...that the High Energy Pellet concept was indeed completely ripped off of Half-Life 2: Episode 1 (noting that the files were called "Combine Ball)," and was also originally going to also be in Portal 2?

...that multiple cakes can be seen on GLaDOS's monitor just before Portal's boss fight?

...that Portal 2 originally had four chapters (+ end credits)? It's hinted by map names and Developer Commentary (Chapter 6 was referred to as Chapter 3)?

...that the number of soundtracks on Portal 2: Songs to Test By (Collectors Edition) is exactly 77 tracks? [5]

...that in the Portal Test Chamber 16 you can move the wall blocks from Rattmann's den trough portals and kill turrets with them?

...that in the video showing Portal 2's level editor, in the scene where everyone is working on a test chamber, one of them is watching Meet the Pyro rather than making a test chamber?

...that The First Slice only has 11 testchambers and you can remove NODRAW trigger to access Testchamber 11 so you can get the upgraded portalgun?

...that in a 2006 build of Portal, GLaDOS was a floating cube of HL2 rollermines?

...that when screws are visible on GLaDOS's monitor in the Portal bossfight, if you have only played that map, you will see one screw, but if you have played more than one, you will see multiple?

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