Baby Kermit, in The Muppet Show, 1x10:

Halfway down the stairs is a stair where I sit
There isn't any other stair quite like it
I'm not at the bottom; I'm not at the top
So this is the stair where I always stop.

Halfway up the stairs isn't up and isn't down
It isn't in the nursery; it isn't in the town
And all sorts of funny thoughts run round my head
It isn't really anywhere, it's somewhere else instead.

Halfway down the stairs is a stair where I sit
There isn't any other stair quite like it
I'm not at the bottom; I'm not at the top
So this is the stair where I always stop.