Falling into some sort of industrial processing thing sounds like a horribly way to go as you'll probably be slowly crushed, grinded to bits, or horribly mangled by some sort of solvent or other nasty chemical before you die.
The iffy thing about this is that I actually vwork on heavy industry so all these things and even containers full of molten metal to fall into are there right in front of me, but it's luckily never going to happen as they hold very serious safety regulations there. So if I'd die there it'll probably be to something more boring.
Talking about unrealistic, I think the absolute worst way to die is by being eaten by thousands of small insects like ants or something.
But that'd never happen, as before there will be so many insects that they'd start attacking people the consequentially increased number of things that eat those insects will have just nommed so many of the insects that the numbers will drop to normal again.