Yeah I've seen a few videos of keepers retrieving eggs from mama retics. It definitely makes you stop and think about breeding them.
I think the second one was a boa that was in food mode. One of my big girls got like that. Took white vinegar on her nose before she gave up, but not until she had hit my hand and wrist three times after wrapping my arm.
Fourth one with the carpet python is how you settle down a nippy baby but you don't remove your hand after getting tagged, you leave it until the snake stops striking and only then you remove your hand. I've used the technique on getting BRB's to mellow out.
The one with the burmese... well they're not all chill and laid back.
The ones with the wild snakes were just people being idiots.