Rant on RAP
"Sir, I understand that you want to leave your estate to your brother's widow for life and then to your children. That's very noble of you. Unfortunately, you have to think of it this way: you can't leave your estate to them that way because there is this pesky rule that we have to follow. We have to consider the fact that your brother's wife and your children can walk out the door today and all spontaneously combust out of nowhere.
Plus, your brother is still alive, so he doesn't have a widow. It doesn't matter that he's married and his wife might live longer than he does. Your brother's current wife can get hit by a car in 5 minutes and die. Maybe he'll remarry and maybe his hypothetical second wife will outlive him, but we can't predict the future. No, I'm sorry, this violates the rule against perpetuities."