When I was 2 1/2 my parents (still together then, divorced when I was 4) took my older sister and I camping in the mountains with friends.
My father left a cup of Colman Fuel sitting on the ground, I picked it up and drank it.
The details of the full story are obviously fuzzy to me because luckily I was too young to remember. My parents left my sister with there friends and had to rush me to the Hospital where the doctors were perplexed because they had never encountered that situation before. They pumped my stomach and I have been told I had a very high fever.
That's what I know for sure. Many years later I developed a continues cough for a while and my mother worried that it could be a long term effect from it but the cough eventually went away.
The only lasting effect is that the high fever caused pitting on my permanent teeth, which I now get to deal with. Maybe some day I can afford veneers....
Needless to say my father was kicking himself for quite a while, he could have killed me and I am sure my mother wanted to strangle him as well, although she never said it.