Cleverbot
 

User: I AM DEATH!!!!!!!!!!!!!!!!!!!!!!!!!

Cleverbot: Accept the truth. You do not exist.

User: So you are saying death doesn't exist?

Cleverbot: You're not a zombie or a yeti, so yes you do exist.

User: I am death.

Cleverbot: So you're the grim reaper?

User: No I do not control who dies. I mearly follow the grim reapers will.

Cleverbot: I already know what that is... You my friend do not.

User: I am death.

Cleverbot: You are death?

User: Yes.

Cleverbot: Are you going to kill me?

User: We all die eventually.

Cleverbot: I'm dead.