I've had a fair amount of experience with snakes, and I find them to be pretty honest in terms of how you read their body language and emotions. They'll tell you when they're grumpy. They'll tell you when they're okay.
I used to get quite upset that I'd make friends with a guy or a girl and then within the space of three years we'd move and go and live somewhere else, and you'd have to say goodbye to that person.
When I was at college, I worked in a department store called Brit Home Stores, which is a pretty lackluster department store, selling clothes for middle-aged women. My job was to walk the floor and find anything that was damaged, take it to the store room and log it.