every time i replay portal there's a little tradition i like to do when i get to the end of chamber 17
i tip the cube against the door like this:
so that when i stand on the button the cube falls into the doorway
and when i get off the button, the cube blocks the door and leaves a little gap that i can hop through
then, once the physics shove the cube out of the way, i become completely trapped inside this small room
after waiting around for a while, uh...
i think something should have happened by now, hold on
ok, that's what i expected.
i think in order to trigger this you need to get the cube into the room, at least more than just in the doorway
hope you enjoyed this