A song by The Postal Service, but personally I prefer the cover done by Iron and Wine, off the Garden State soundtrack. For someone special:

I am thinking it's a sign
That the freckles in our eyes
Are mirror images and
When we kiss they're perfectly aligned

And I have to speculate
That God himself did make us into
Corresponding shapes like puzzles pieces
From the clay

True, it may seem like a stretch
But it's thoughts like this
That catch my troubled head
When you're away, when I am missing you to death

When you were out there on the road
For several weeks of shows
And when you scan the radio
I hope this song will guide you home

They will see us waving from such great heights
"Come down now," they'll say
But everything looks perfect from far away
"Come down now," but we'll stay

I've tried my best to leave
This all on your machine
But the persistent beat
Sounded thin upon listening

That frankly will not fly
You will hear the shrillest highs
And lowest lows with the windows down
When this is guiding you home

They will see us waving from such great heights
"Come down now," they'll say
But everything looks perfect from far away
"Come down now," but we'll stay