Caroline sighed as her boss made yet another recording.
"All right, I've been thinking." He said into the microphone. "When life gives you lemons, don't make lemonade - make life take the lemons back!"
Caroline stared at him as he continued. She was now completely sure that he had lost it.
"Get mad! I don't want your damn lemons, what am I supposed to do with these? Demand to see life's manager." He slammed his hand down on the desk. "Make life rue the day it thought it could give Cave Johnson lemons." He grinned.
Caroline tried to not claim that she didn't know him.
"Do you know who I am? I'm the man who is gonna burn your house down! With the lemons!" He said. ". I'm going to get my engineers to invent a combustible lemon that burns your house down!"
'Yet another time wasting project.' She thought as she made a mental note to make sure the orders got lost. 'Though, combustible lemons could drive Black Mesa for a loop. Hm.'
This came from listening to the "Lemon Rant" too much.
And combustible lemons would be cool.
This bit is actually a big part of Cave Johnson's voice lines. May add more.