Absolute alcohol (200 proof ethanol) has a number of ways to kill you. It's slightly poisonous on its own. It's a massively powerful dessicator, so it can turn tissue into leather. And, if you've got industrial quantities of the stuff, it's probably not quite pure: turns out you can't just distill it past 190 proof due to water and ethanol forming an azeotrope. To push past that limit requires azeotropic distillation using such fun substances as cyclohexane, benzene, and isooctane, and they definitely do exist in the final distillation output. Most of these are rather more poisonous than ethanol on their own, so you don't want to drink them.

So don't bloody well drink anything above 190 proof, ever, no exceptions! Though when you're going through 55-gallon drums of it to clean clean-room equipment, a lot of it tends to end up in the air... turns out you can get enough alcohol in the air to get noticeable effects on you.

Like I said, lots of ways to kill you.