Emoticons and the mobile forums
Haven't tested with all of the smilies, but
does not render when viewed in mobile. Instead, it just displays the raw rotate (enclosed with colons) text.
Interestingly, it doesn't seem to have rendered in this OP either, on the full site. Here's a link to an example post that is working:http://forums.penny-arcade.com/discussion/comment/23902271/#Comment_23902271