I have and they are so chilling. Imagine though. The lyrics are probably Kaneki singing to Hide. Potential spoilers after the cut.
"I’m broken, so broken - amidst this world. Yet you laugh, blind to everything."
Referring to the fact that Kaneki’s life was shattered by his transformation into a ghoul. But Hide stayed right along side him and laughed and had fun as if nothing was ever wrong. Of course, Hide probably did know the whole time, but Kaneki didn’t know that.
Please don’t bother looking for me; don’t stare at me..
I merely don’t want to hurt you, inside a world, that came out of someone’s imagination.
So please remember me; as vivid as I was.
Referring to his further transformation into Shironeki. He was so tortured and so broken that his psyche completely shattered and he changed horribly. Hide was the closest person in the world to Kaneki, so he didn’t want to Hide to see what he had become.
Please don’t forget me, don’t forget me, don’t forget me, don’t forget me!
I don’t think there’s anything I can add to this. There was no one more special to Kaneki than Hide. Kaneki was too afraid to go back where he might not be accepted again. But he really loved Hide. And the pain of losing him was excruciating.