Just had a look at the report about the 7'3" Rattlesnake. Poor snake. Did they really have to kill him? (Her probably because of her size - females are usually bigger than the males)
Most snakes, with the exception of the Mambas which are notoriously territorial prefer to warn people off by, in the case of a Rattlesnake, rattling their tails. I've been up close to a Rattlesnake (it was in a viv though) and their rattles are really loud. Like most snakes, they like a quiet life and prefer to slither off in the opposite direction.
Cobras are the same. They will rear up, show their hoods but as soon as you back away, the hood goes down and they disappear in the opposite direction. Been very close to Cobras too. Magnificent snakes.
Although I wouldn't keep a venomous snake as a pet - for one I'd need a DWA Licence and two, I prefer something I can handle without any fear of being bitten, I would still like to learn to handle them properly. I do know a professional snake handler who did say he would be willing to teach me but I just haven't had time as it would involve travelling quite a distance.
Iguanas make really good pets. My daughter had an Iggy a few years back. He too was house-trained (she still lives in Scotland) and I didn't believe her when she said he used the cat's litter tray - until I saw it for myself. He would come and sit on you too and loved his chin being stroked.
Sadly he died a few years ago

We weren't sure how old he was because my daughter's other half got him from a friend of a friend. He was about 5ft long.