Inside Jokes: Using Humor to Reverse-Engineer the Mind by Daniel Dennett, Matthew Hurley, & Reginald Adams
The rough summary is that humor is "the joy of debugging" - an evolutionarily-installed mechanism to provide delight (incentive) to humans for finding (recognizing the absurdity and then removal) of incorrect beliefs.
https://www.amazon.com/Inside-Jokes-Using-Humor-Reverse-Engi...
Thinking, Fast and Slow - Daniel Kahneman
The Signal and The Noise - Nate Silver
Predictably Irrational - Dan Ariely
This Time is Different - Carmen Reinhart & Kenneth Rogoff
Subliminal - Leonard Mlodinow
Fooled by Randomness - Nassim Taleb
For something more lighthearted, I also enjoyed:
An Economist Gets Lunch - Tyler Cowen
Inside Jokes - Matthew Hurley & others (mostly skipped the dense parts)
If this was serious she would at least mention this recent book, which presents a deep and subtle evolutionary explanation, along with a thorough review of past theories, and yes includes lots of jokes: Inside Jokes by Matthew M. Hurley, Daniel C. Dennett, and Reginald B. Adams Jr. http://insidejokesbook.com/
Basically, humor is a learning mechanism. It's funny when we take something to be true and then suddenly discover it to be false (as long as there is no immediate danger).