Philosopher 1: "I am immortal." Philosopher 2: "How do you know?" Philosopher 1: "Because in my entire life, in my entire experience, I have never died."
Philosopher 3: "Stop being pretentious or I'll send Philosophers 4 & 5 around with baseball bats."
It's easy to do a lot of things you shouldn't do, so it boils down to a question of ethics really, doesn't it?