The Undead Pizza Delivery Man (and, yes, there is a miniature for it - a Skeleton delivering a pizza - that came from some joke set of mini's years ago).
The campaign was just for fun (well, they all are, but this one was meant to be crazy) and every once in a while the pizza delivery guy would show up at completely random times (sometimes even during a combat). Each time the pizza got more expensive. It had 8 slices. each a different type, and when you ate them they would have random permanent effects on you, 6 good and 2 bad slices, varying from raising/lowering stats, granting special abilities, etc, etc.
Enemies in the campaign were wacky too... I remember fighting the Energizer Bunny for example.