This site is super useful for all sorts of things that you can't really just type into Google. AskReddit on Reddit (funny enough) is a goldmine for personal experiences that are sometimes ultra-specific, so sometimes I search there to see if anyone's posted anything that could help me.

To answer your question, probably a mix of ultra specific injuries and DIY medical crap. I've got a friend who looks up gore and such, so normally I just ask him, but y'know.