Show me yo' swag, kids. Your Bungie swag, of course.
Or, if you're not a real fan, a selfie with some Bungie paraphernalia should suffice, maybe a copy of Halo or Destiny. Alternatively write Bungie or doodle Destiny on your shirt, thereby ruining it with a shitty pen.
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My personal favorite, being able to talk to a bunch of developers whole they signed the guidebook & copy of the game for us. [spoiler]This one is on their website, that's why it's way better quality than my phone lol. [/spoiler]