Radiohead

I am the key to the lock in your house, that keeps your toys in the basement
And if you get too far inside, you'll only see my reflection
It's always best when the light is off, I am the pick in the ice
Do not cry out or hit the alarm, we're friends till we die
And either way you turn, I'll be there, open up your skull
I'll be there, climbing up the walls
It's always best when the light is off, it's always better on the outside