A (usually) mundane and useless piece of knowledge, or field of expertise, that comes into profound effect as the one question you can answer at a pub/supper quiz.
It has also been known to be used as an excuse for quiz players with poor general knowledge.
Quiz master - 'What is the radius of the centre circle on a standard size soccer pitch?'
Someone who travels to another town, to another Pub to enter a pub quiz. Mentally challenged at their own local pub, travelling to another, with dimmer clientele, they are worshipped by their fellow team mates.
“How come that team keeps winning the weekly Pub Quiz at the Lamb and Flag?”