In the warehouse fight section of Entropy Zero 2, you can climb onto the catwalk and run past everything all the way to the Mossman scene and it breaks her pathfinding/script.
So, just wanted to see what the community speculates about whatever this Cave Johnson line in Portal 2 is alluding to: "Greetings, friend. I'm Cave Johnson, CEO of Aperture Science - you might know us as a vital participant in the 1968 Senate Hearings on missing astronauts." What was Aperture's role in the hearing? Did Black Mesa also participate? What exactly happened up there?