It almost takes a lot of trying to die from a rattlesnake bite. We average only 5.5 deaths by rattlesnake bite in the U.S. each year. Many rattlesnake bites involve alcohol. They do have a nasty bite and even during treatment, there can be a fair amount of suffering. In the US, if you get bit and seek help as fast as possible, you'll probably be fine.
I'd always read that the puff adder was the most dangerous snake in Africa and kills the most people. Not that it is the most venomous, just camo'd, fat and slow, so people stumble upon them.
Puff adders are harmless, but they LOOK JUST LIKE A CORAL snake, # 8 on Sledges list. There are 2 ways to tell the difference ;
1) the order of the Red yellow and Black bands
2) Aggression, If it jumps up, Hissing and Growling (No shit, I never even HEARD of that one, but I've SEEN it ) it's a Puff Adder, if it just kills you it's a Coral Snake.