In the series Superbadfic, Sam and Dean discover bad fanfiction while searching for a case file. They decide to add it to the list of things they hunt.
The stories are told in the form of Ficspam: Fiction plus pictures.
Superbadfic I -- Sam finds something new to hunt. It starts with Mary and ends with Sue.
SuperbadficII: When fanfgirls attack! -- The boys ponder Wincest, and Dean finds a solution that warms every Dean!Girl heart.
SuperbadficIII: Dude Looks Like a Lady -- Dean's mouth gets him in trouble.
Superbadfic IV: Mary Sue, Who Are You? -- The many faces of Mary Sue.
Superbadfic V: Canonize This! -- There is a new weapon in the war against bad fiction.
Superbadfic VI: This Looks Like A Job For . . . -- Dean speaks in Capslock.
Superbadfic VII: When Good Fictives Go Bad -- There's something wrong with Dean.
Superbadfic VIII: Fate's Lightning Rod -- Dean? A walking barometer for bad fiction avatars.
Superbadfic IX: Do We really need to get in to this? -- So what kind of tattoo repells a Mary Sue?
Superbadfic X: It Slices, It Dices, It Surgerizes! -- After a reinvent renvent revenant zombie hunt goes wrong, Dean is stuck in the hospital. Unfortunately for him, Raven is a doctor and works on people. She surgerizes them.
Superbadfic XI: You Fight Like A Girl! -- Even hunters have an off day. Sam and Dean discover crossovers.
Superbadfic XII: Wee Free Men -- When Dean wakes up tied to the bed, it can only be an avatar problem. Or possibly the fangirls got to him.
Superbadfic XIII: Constructive Criticism -- In which Sam is tied up. Again. And the author realizes she might have a bondage kink.
Superbadfic XIV: I don't Speak Leagalish -- It was only a matter of time.
Superbadfic XV: The Unwilling Sues -- In retrospect, Sam and Dean should have called Bobby and warned him.
Superbadfic XVI: Sam Winchester for the Defense -- Sam has his say.
Superbadfic XVII: The Girl With the Eyes -- She bends the rules of time and space like silly putty.
Superbadfic XVIII: Like Shooting Fish in a Barrell - What do you do about a girl like Parody Sue?
Superbadfic XIX: You See the Darndest Things on FF.Net -- some fiction is just beyond help.
Superbadfic XX: Alphabet Soup -- A typical Winchester Argument.
Superbadfic XXI: Licence to Thrill -- Once again, Dean isn't Dean. This time, Sam doesn't mind.
Superbadfic XXII: Super. Bad. Friends -- Dean meets Sam's new old friends.
Superbadfic XXIII: Dont Fear the Legion -- In which Sam gets them in serious trouble.
Superbadfic XXIV: Wish Fulfillment FTW! -- Love is All You need. Or in the case of some fanfic, hot bibro action.
divas_lamentgave me Superbad Icon Love. The icons are
here. And Sam pwns baby pandas
here.