Wait, I read science fiction books! All I need to do is present you with a paradox! This statement is false!!
Psh. We've evolved far past the point of being confused by mere sentences.
So nothing can kill you?
Well, the password can...but it's kept so secret, not even robots know what it is. I doubt a primitive from another millenium could possibly discover it.
I know, Mike! I know! Every fucking day for 300 fucking years you've told me you're a fucking robot, I get it! I'm not stupid! You're a robot, okay! Now shut up!