Bungie underwear!
Seriously, it would sell.
Boxers with a "Warning, Chainsaw Jockstrap Inside" and a pic of the Webmaster.
Asbestos underwear that says "Protect yourself from flames, wear this whenever going online".
"Wildcat destabilization inside".
"This cave is not a natural formation"
Come on, Bungie underwear would be cool. Just like a fez.
[Edited on 01.02.2013 9:12 AM PST]
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Oh yes... My girlfriend would go nuts over those (if you'll pardon the pun).