What is this and how the hell did it get stuck inside my rear windshield?

The next obvious question is, how do I get it out? Looks like I'm gonna be removing some car panels this weekend >_<

Ken Loh
Design, Photography, Car, Gadget, and Internet Nerd.
http://kenloh.com
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Why Caitlin hates my M3.

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Slower than a sleigh, but the elves seem to enjoy it. My video interpretation of the @oakley holiday card.