Fanfiction Barrier

How far you need to be in a book, series, etc. before you can safely and seriously start reading fanfiction.

Liz has only watched three episodes of Supernatural.
Liz: OMG, Sam and Dean are soooo cute together! Check out this fic!
Jo: Bitch, you haven't even crossed the Fanfiction Barrier!
Liz can't read fanfic, come on!