Most people prefer not to think about the wills of their loved ones, since it means you have to think about their death. But eventually, everyone dies, and most people have a will tucked away somewhere - even if there's no money to leave anyone.
In most cases, wills are dry documents that predictably split assets among loved ones. But there are occasions when they get spicy, and a long-standing grudge is shouted out from the after-life.
"To my wife I leave her lover and the knowledge that I was never the fool she thought me. To my son I leave the pleasure of working for a living - for 25 years, he thought the pleasure was all mine." --- Best dis ever.
Was in my Wills & Trusts book in law school as an example of people talking shit in their wills (you're supposed to discourage them as lawyers from doing so).