We had a D&D campaign where one of the characters, a female elf oddly enough, ended up meeting a spider king and getting a set of armor that could change her into a drow drider. Usually at just the wrong time. Chaos and hilarity ensued.
(In all seriousness, I more just meant that I was intentionally siting one of the more ridiculed aspect of many RPGs, which is defeated if you start citing rules that actually factor in the significance of size to a realistic degree. Of course... then we have 2nd edition D&D, and the whole thing where being size large can sometimes cause you to die QUICKER to certain types of weapons than if you were of a smaller, presumably more "squishy" size XD.)