Yeast. What's the strangest you tried?

[Bumpy Bear Brewery]

So, I've been fascinated by the different and wide ranging strains of yeasts available to us as homebrewers and the flavours, aromas and sensations that go with them.

By just doing a bit of google searching you see stories of brewers using logs, finding yeast in 200 year old bottles and even in ancient pottery. Bringing me back to my original question, what is the weirdest, strangest, oldest, funniest yeast you've used? Where did it come from and what results did you get?