Things that piss people off about MD: lack of library search, lack of free pies and lack of Oxford commas.
@Mangamoz the comma placed before the 'and' in lists . difference between "x, y and z" and "x, y, and z*
@Mangamoz well it's just a style preference. i think going without looks ugly and makes stuff hard to read but there's not one official way to write it
@girlrotting If it's any consolation, it was a borderline painful conscious effort to omit it in that sentence. I also strongly prefer its use.