My name is Nat.

I can't tell you my last name. Why? Well, it's not because I'm fighting a secret war against mind controlling aliens who would grasp at any little piece of information that might allow them to hunt me down and capture me.

Really, that is not the reason. What you just did there, friend, is called jumping to a conclusion.

I almost wish that I was being hunted by mind controlling aliens, though, because the real reason I can't tell you my last name is way more mundane and tragic.

See, I can't tell you my last name because I don't remember what it is.