"We bust our way into a megafreighter I still don't know how, marched on to the bridge waving toy pistols and demanded conkers. A wilder thing I have not known. Lost me a year's pocket money. For what? Conkers.
The captain was this really amazing guy, Yooden Vranx," said Zaphod. "He gave us food, booze - stuff from really weird parts of the Galaxy - lots of conkers, of course, and we had just the most incredible time."
Of course in this well pre-internet age I had to wait literal YEARS to find out what conkers actually WERE. Luckily my aunt was an anglophile and went there six or seven years later. Before she left I asked her to find out what conkers were for me. When she returned she told me what they were and... to be honest I was kinda bummed out it wasn't something more elaborate.