[trebleshot]

I still think most of those origins are perfectly plausible. This is a fictional universe and no one said it has to obey our world's natural laws of physics, biology and such. Besides, if you put too much thought into any superpower or mutant ability, the science of it breaks down faster than a sandcastle at high tide - just try it with Superman sometime.

Here's some food for thought, Iceman:

If you were creating the Hulk today, how would you write his origin? He has to have the same look, powers and abilities (i.e. fueled by rage, can't always control the change, etc). Personally, I'd opt for a chemical cocktail a la the original inspiration for the Hulk: Dr. Jekyll & Mr. Hyde.