I was at the airport recently waiting for my luggage at the baggage claim, when I saw a cardboard box on the carousel with a sticker that said, "Donated human tissue not suitable for transplant".  This was puzzling.  Why would someone donate human tissue, presumably an organ or an eyeball, for a reason other than transplanting?  What else would it be for?  Food?  Party trick?  And what would make such human tissue "not suitable" for transplant?  Contagious disease?  Wrong size?  This isn't the kind of problem you want to be solving after spending all day in airports and on planes. 

Turns out some commenters on a website say donated human tissue can be used for research, college demonstrations, and long term storage (i.e. saving umbilical cord cells for future use).  Weird.  And gross.  Puts that "items in overhead bins may shift during takeoff and landing" thing in a whole new light. #health