Some of them will never give up. Our main nasty goose greeted a farmer friend that stopped by one day by promptly chomping into his leg the minute he stepped out of his truck. Being a burly farmer he reached down and grabbed the goose by the neck and held him out at arm's lenth and the goose put up quite a fuss. The farmer loved how mean the goose was so he instantly started a negotiation with me to let him have the goose. As we continued talking the farmer was getting a wing beating but being a farmer that loved mean geese he just stood there holding the goose by the neck and kind of enjoying the fanning of the wings the goose was giving him. Well after a minute or two the farmer let down his guard and also his elbow and the goose's head was now within striking range of his upper arm. Now if you have never had vice-grips clamped onto your bicept you do not know the pain that a goose and inflict onto your bicept. When the goose made contact the farmer's eyes got really big and he let go of the goose. The goose held strong for about 2-3 seconds and then let go, dropped to the ground and skampered off hissing the whole way. The farmer had blood coming out of the pores of his skin where the goose got him.
That farmer visited often and he just loved to harass that goose and the feeling was mutual.
Our dog put up with the goose harassing her for quite a while and being a duck dog the dog was all the time thinking WTF am I tolerating this? Every day the dog would growl at the goose and the goose would hiss at the dog as they passed each other, but nobody crossed the line. One day the goose decided to push the system and he chomped right into the dog's butt. That was it, the dog had had enough. She turned in a flash and grabbed the goose by the neck/shoulder region and started to shake. After a good ~15 seconds of shaking the dog flung the goose and let out a growl that I had never heard that dog utter before. The goose landed and bounced and got up and shook off the shaking and then let out a honk. From that day forward there was no more hissing of the goose or growling of the dog when they passed each other. I swear they were giving each other the slight head nod as if to say "don't make me come over there!"
Right now my brother has a fox that is trying to get into the barn to get his ducks and geese and chickens each night and he shows up about 3 am. The geese are going bonkers when the fox shows up which wakes my brother. So his sleep is getting busted up and so my brother is getting a total distain for this fox. So far the fox senses any movement in the house and takes off at warp speed so he can't get a shot at the bugger.