@Kurando:

When you're out in the woods, do you happen to drink fresh water from the springs and creeks running freely there? Because these are likely to be lightly contaminated with quicksilver in some areas of BC. It won't kill you, but it will cause halluzinations. People see all sort of things when they drink too much of it, I'd imagine hearing Bigfoot would be pretty much the first you'd experience in that case.