Not that hard to train your goats or cows to this; highly dependent on the animal's inherited personality though. I would routinely milk one of our cows when I was a kid right out in the pasture. She was calm as ever, no food was ever required, and she was never tied to anything. Obviously, she was just very happy to be milked and have the pressure released from her utter (her babes were the same ilk). I agree though, seeing the goat line-up is quite interesting. :-D My current herd would not stand for it, I assure you.