One time in college i was on one of those weird wikipedia rampages where you just keep clicking links to new articles. One of them was a respiratory condition called pleurisy... the next day my friend called complaining that he was sick and I was like "that sounds like pleurisy! It can be dangerous so you should see a doctor!"

So he went to the dr who sent him straight to the ER, and he was in the hospital for about a week after...

Dx was pleurisy