Here's a fun little gem, courtesy of Retronaut: advice from the US Embassy to American tourists in Nepal regarding the Yeti, from 1959. I especially appreciate the 3rd rule, wherein the ambassador acknowledges that, yes, okay, we don't actually have any proof of the Yeti's existence yet, but you still have to follow these guidelines, and also if you happen to find any substantial proof of Yeti claims, would you kindly pass them on to the Nepalese government?
I don't know, man, I smell a conspiracy. Unless...that awful smell is actually the Yeti itself?