Corpse Driving

I'm a corpse walker. This time, my job is to collect the dead from the battlefield and return the bodies of those who hired me to their hometowns, where they can be laid to rest. As I shook the golden bell in my hand, five corpses missing arms and legs swayed into a line in front of me. They were chatting and laughing along the way. I couldn't help wondering: how could corpses still laugh?