Every bird is an individual. I had a Jersey Giant chick that at about a week old, started chest-bumping my hand when I'd change the water and feeder in the brooder. So I'd flick him in the chest, you know, with my middle finger cocked and released against my thumb. Thwap! Not hard, just a response. Over the next few days, he'd thump me harder (the other chicks were all pullets), so I thought, okay, you want to play this game? Every time he chest-bumped my hand, I'd thwap him, just a little harder than he hit me. One day he didn't quit. Kept coming at me. So I kept on, too. I thought, I have to win. I'm not going to hurt him, he's just a baby. But if he thumps me 200 times, I'm thumping him 201. It didn't take that long, but maybe about 20. Finally he stood there looking at my hand, then turned around and joined the girls. He grew up to be a fine young rooster and I quite liked him. But he was barely a year old when a coyote came and got him and 4 of his Black Australorp sisters. I think my good little Sheltie, Gracie, was off having surgery that day.