A piece of information that is slightly obscure and that would make an ideal pub quiz question.
Pub (quiz) + Nugget (of information) = Pugget!
'Who did Val Kilmer play in the film 'True Romance?' or;
'Who is Gary Oldman's sister better known as?'
...would qualify as 'puggets'.
In a sentence:
"Did you know that Gary Oldman's sister is Big Mo from Eastenders?"
"Really? That's a great pugget!'