"You again"

How bout that, not just a bad movie title, this is a phrase that implies an annoying person who just keeps coming back and never leaves.  It's far from just Internet crapshit, though: teenagers use "You again" to one another in social situations as a shortened version of "Fuck, why are you still here?  Go kill yourself already."

And here you're wondering how I wonder why the world is so fucked up and never changes.

I know you don't likey, Mr. SFBE, so I'm gonna say it anyway.

You again.