Fucking Word docs.  Which are checked into source control, except people (who are nominally developers, or project managers who were supposed to have been developers once) insist on versioning in ye olde rename-and-add-a-number style.  With PDFs that are manually generated by exporting said Word documents from Word, and then again checked in, and again checked in in multiple renamed versions.  Except sometimes only the PDF is checked in, without the source document...<p>So we have a doc folder in the repo that is like staring into the maw of Cthulhu and takes up 90% of our build time on the CI server sucking that down mass of garbage for the checkout.<p>Saner systems have been proposed, but rejected because the powers that be are too averse to change...