Can come in the form of fanfiction, fanart, photo edits, etc, etc.
Me: Yeah, meh too! Say, did you know the extras include a David Tennant personal video diary?
Biggles: O RLY?!
Me: YA RLY!
Biggles: O.O NO WAI! OMGZ!
Me: IT'S UTTER FAN!CRACK !!!! *squee*
Biggles: TTLY! XD *seizure*