Your comment about the donkey and the chain on one foot --- my grandpa, an oldtimer from years back, used to put a hobble on one foot of our pony mare, with a chain attached to that hobble, because she was hard to catch. When she ran away from us, she had to drag/swing the chain and it slowed her down. Plus, if we could step on the chain we could catch her easier. Anyway, it didn't work for long, she was smarter than all of us. She learned to swing the leg/chain so that she could run just as fast as ever.