I wasn't feeling great yesterday. I was kind of woozy, so I took a pepto and went to bed.
I woke up today, and stumbled in to take a piss. Being a man, I spit in the toilet and it was black. I spit again -- black. ...and again.
I thought it was dried blood, so I got freaked out.
When I looked in the mirror, my entire mouth was black -- my tongue, my gums and teeth. It looked like I'd eaten one of those black candies that turns your mouth black.
I brushed my teeth and tongue thoroghly and even then (although much less) I still had some black in my spit.
I did a little research and it turns out it was this:
http://www.mayoclinic.com/health/black-hairy-tongue/HQ00325Apparently, in some people, bismuth (a chemical in Pepto) causes an overgrowth of a black bacteria in the mouth, and can turn your turds jet-black too. Weird.
My tongue is now back to normal.