Help me analyse the emotions in this video of fynman?

sensible27
I'm not perticularly good at reading emotions, can someone try and explain what might be going through his head at 0:25-0:30 minute mark if not the whole video? Thank you for considering. : )

https://youtu.be/f61KMw5zVhg

Spell error *Feynman
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12 d
I was referring to the almost maniacal laugh.
Help me analyse the emotions in this video of fynman?
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