Today at work, I amazed my coworker because I knew what Ehlers-Danlos syndrome is (it's a genetic condition which affects the collagen protein, so causes problems with tendons at joints, skin fragility, etc). But I just soak up stuff nobody needs to know.
This site is chock full of that kind of stuff. I read a couple of the articles and it's all about neat stuff that you don't really think about in normal life, but now I will think about every time somebody coughs. ;) Amaze your friends and family with all the stuff that you know, and they don't, so neener neener. Trivia is also very useful for amusing small children.
I also know how to grow botulism and how to euthanize a fish.