There are plenty of cases where it's hard for the layperson to determine if something is serious or not.
Life threatening, yes, but many people have ordinary emergencies likes burns and big cuts and won't go to ER because they know they can't handle the bill and will attempt to suck it up and self treat; even if it's not wise to do so. Emergency rooms aren't free; they have to treat you, yes, but they're going to bill you as well.
For example: Intoxication by adulterated liquor can cause strong headache and (permanent) blindness; but if you search in Google you may find out that drinking pure Whisky right away can neutralize its effects.
http://en.wikipedia.org/wiki/Methanol#Toxicity
Specifically, anything with a strong ethanol content will help, as the damage caused by drinking methanol results from the byproducts of you body processing the poison. The biological pathways that process methanol have a greater affinity for ethanol, so drinking whisky (or everclear or 151) or any other strong alcohol will keep you alive until your body has a chance to eject the methanol as a waste product.
http://www.bio-nica.info/Biblioteca/Gutierrez-Intoxicacion-M...
The theory is this: The consumption of ethyl alcohol (whisky/vodka) can prevent the conversion of methanol to formaldehyde and formic acid plus it extracts the toxic substance and neutralizes its metabolic effects.
See the 2nd paragraph after the warning banner. It might not look serious, but it is. This review is written by an MD.