fics that have become headcanon

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I'm interested in reading the fanfics that have inspired fans to include them in their personal SPN head canon. I know that as far as I'm concerned hc!Dean used to play the piano and is obsessed by numbers, if Sharlot wrote it then it really happened, Sam and Dean totally took on an Erlking, this wee!chester story is true, and this happened to Bobby.*

One thing I don't want is to provide a place for people to bash headcanon (hc) they don't agree with - there's room enough in the world for everyone's canon and no need for them to agree. So tell me how your hc!Bobby met John Winchester or how your hc!Sam made different choices with Ruby. Did your hc!Dean secretly get accepted to college? Whatever it is, send it my way. :)

All formats (full stories, episode tags, "other") and various OTPs are all welcome.

* I am also tempted to include the first few chapters of the Strangers and Angels 'verse just because it makes me happy.