He came up to me this guy and introduced
  himself
"Hello", he said, "I'm You"
I looked at him uncomprehendingly, even a
  little afraid
I thought 'How can you be me, I'm me... not
  you'
It's like he'd come to take me over
He was after my pronouns
He wanted to own me
It was like Invasion of the Body Snatchers
Or the Angel of Death, the Grim Reaper come
  to get me
I was about to take off running down the
  road
I thought "You can't take me, I... I'm already
  taken
Then I thought 'If you're me then who am I,
  I'm what then....
Maybe that was it, maybe I was a What now
And he... he was a What-not or a not-What
"You! You're You", I said back to him a little
   doubtfully
"You", he said again this time with emphasis,
  "You O'Brien"
I looked at him closely "You, you're You O'Brien" I said slowly confirming what he'd
  just said/told me
Then it hit me You!... Hugh the Borg from Star Trek (the Next Generation LoL), that episode the Borg collective Guy becomes an individual
"You're Hugh" I said greatly relieved, you're
   Hugh, Hugh with a H
It was like I'd been released 'So you're not
  me after all'.

When he'd gone though I thought, maybe if he had of being me he might have made a better job of being me than I did.