Whilst recently shopping, I grabbed a bottle of Cachaça 51 intended to use for some flambé. Upon opening it, I found it smelling (and tasting) like slightly sour milk.
Googling for it, I didn't come up with any hits about it at all, which makes me wonder what's going on.
Edit: I have had a straight Cachaça before, but it was a different brand, and it didn't have this sour milk taste.