Arthur: you can't go out there, you'll die!
Merlin: no, I won't! I don't believe in death, so I can't die!
Arthur: Merlin.... Oh, goddamn it, Leon, explain to Merlin why this is wrong!
Leon: Sire?
Arthur: you can't seriously think he's right!
Leon: ... Well, I mean, I don't believe in death either and I haven't died yet, so his logic is kinda sound
Arthur: and how old are you, Leon?
Leon: 430-ish, I think?
*Gwaine walking past*
Gwaine: humans live for 400 years and already think they are Immortal *rolls eyes*