Spoilers beyond for Aperture Desk Job, and Portal 2 if you haven’t played it.
Do you know who I am?
I’m the man who’s going to burn your house down!

I’m going to get my engineers to invent a combustible lemon that burns your house down!"
There areunused voice lines from Carolinethat suggest her incorporation into GLaDOS was done against her will.
I gotta tell you, though, I was absolutelydelighted.

Aperture Desk Job takes place somewhere before the mainline Portal games.
It doesn’t have to even mention Cave.
And yet, here he is, threating to fire you and begging for oblivion to take him.
Cave Johnson, for all his shouting about lemons, isweak!
He could still be there, alone, singing with a bunch of toilets, in the dark.
I wish him much misery of it.
Like everything in these games, Cave’s ending has a very light touch, but a heavy impact.