My iPhone 5 rattles, does yours?

When I shake my iPhone 5 there is a rattle sound coming from somewhere near the top of the phone. It seems to loose to be the vibrator moving around but I'm not sure so I'm asking on here. Do any of your new iPhones do this?

Also if I hold all the buttons in place it still rattles so it isn't a button.

If I'm the only one should I worry about it?

Here is a YouTube video taken with my phone, if you put in headphones or turn up your speakers you can hear the rattle as I shake the phone.