What are Feynman and Dirac discussing in their conversation?

[Ravi Mohan]

The game is to guess what Feynman and Dirac are discussing.

I guess Feynman is explaining his principles of quantum mechanics.

"... see Paul, I have come up with three simple principles which capture the essence of quantum mechanics ... a) The probability of an event in an ideal experiment is given by ..."

Read http://www.feynmanlectures.caltech.edu/III_01.html#Ch1-S7 for complete statement of the principles.

 

[Enigman]

Guesses:
*Dick is telling Paul about the last night's ball game.
*Feynman diagrams.
*Dick is threatening to bash Paul's head in if he continues making disparaging comments about poetry. (Physics and Poetry)
*They are posing for a photograph.

 

[Ravi Mohan]

Nice! Although the last one does not seem feasible as Dirac wasn't found of getting photographed (or so I have read/heard).
The second last guess is hilarious.

By the look of excitement on Feynman's face, I am sure that it must be some physics discussion (Feynman diagrams might be quiet close).