If it doesn’t have to be a serious argument then I think I have a winner. Just the other day I heard a few friends arguing over whether tortoises are immortal. Let’s give them names. Kyle, Daniel and Zac. Kyle: Do you believe that tortoises are immortal? Zac: What? No! Kyle: Prove it then. Have you ever seen a tortoise die? Zac: No! But they aren’t immortal! Kyle: But you’ve never seen a tortoise die, therefore you have no proof. At this point he goes over to Daniel and asks: Hey Daniel, do you believe that tortoises are immortal? Daniel: Of course! By this time I was very amused and Zac was visibly getting frustrated (in a good-natured way) Kyle (to Zac): Until you see a tortoise die you can never say that they aren’t immortal. Zac (points to me): Ugh, Saturated_Brain’s going to die. He’s not immortal! (needless to say I was rather amused by this) Daniel: Ahhh… But you see, until Saturated_Brain dies we’ll never know whether he’s immortal or not. I don’t know how it ended (I think Zac just stomped off) but philosophical implications aside, this was perhaps one of the entertaining conversations I’ve ever heard in a long time.