I have seen a few seem to think somewhere between 1-2g, causing unpleasant side-effects, are in the OD level.
Technically, it's over the comfortable dosage, but... "OD" as everyone knows it means that it threatened the life of the consumer.
You may get sick after 1g of caffeine, but not everyone does (tolerance, obviously)... and it goes no further than nausea and possible extreme lethargy.
I did that on quite a few occasions, over a time no longer than a handful of hours, and suffered no "negative" effects, though I was definitely lethargic later in the day after the crash. The super-buzz is exactly what I was wanting, so I kind of new hour to handle the elevated feeling. It was most definitely an extreme caffeine high whenever I went that route, and I sought it. :biggrin:
And I had looked into getting pure powder, more economical than caffeine pills, and could help make a high-potency cup of coffee.

But alas, I kind of feared the actual idea of owning pure caffeine, kind of would have made me felt like a junkie.
I've had nasty nausea and/or a torn-up stomach, but nothing more severe. But I could definitely understand 1g causing some people some nasty side-effects.
But man, I sure do want to award this guy a damn Darwin Award.

I mean, seriously.. you took that much caffeine powder?
Fuck warning labels, let this fucking idiots keep making insanely idiotic decisions.
I guess some people just forget caffeine is actually a lethal chemical... but we have it readily available in so many products, seemingly without regulation, that they get numb to the concept of it being an actual drug.
Also, fairly similar with dogs.
They aren't "allergic" to chocolate, merely, another chemical found in a few plants of the
theobroma family (found in cacao and tea, can't remember if it's in coffee or not). Just like caffeine is lethal to us, it is lethal to dogs. However, dogs are more sensitive to theobromine than we are, which is found in a good quantity in chocolate. Eating a chocolate bar worth of even dark chocolate? Not likely to cause any side effects, though likely more energy. Milk chocolate, probably won't feel much.
Eating a 3lb box of chocolate? A small dog it might kill, a large dog it will probably only make it sick and lead to puking.
You can give your dog chocolate just like you give yourself coffee - keep it reasonable (and for dogs, far far less often - don't need to indoctrinate dogs into our drug consumption habits

)