'I'd poison him," says my friend Amanda, helping herself to the last slice of cinnamon upside-down cake. "Really?" frowns Dianne. "I wouldn't. The dosage might not be high enough, and then what? You end up being his nursemaid for the rest of your life? That's probably why you wanted to bump him off to begin with. No, I think I'd suffocate Chris. Less risky."