I am reminded of the time that a party of adventurers came across a troll... no problem, fire does it for trolls!<br/><br/>exceptthis troll didn't seem to mind fire. By the time that they had figured out that the troll had gotten ahold of a ring of fire resistance (2nd ed resistances were very difference), half of the party was combat ineffective and one was dead because he wanted to shove a torch into it's mouth... All because the players assumed that  they knew all about trolls.<br/><br/>So... I wouldn't rely on the fire thing... and ever heard of a crushed beercan? I never assume that any of my tricks in character creation will actually do any good.