Interesting... It never made sense to me that a spaceship captain just would happen to have chestnuts on board his ship, so I guessed it might be something like

Interesting... It never made sense to me that a spaceship captain just would happen to have chestnuts on board his ship, so I guessed it might be something like candies. A generic term for things that amuse children works too. I still feel like Adams was referring to something specific.