I had a couple cups of left-over coconut milk (the kind in the carton, not the can) in the fridge & sort of forgot about it. When I got it out today it was frothy on top & had a strong coconut smell - which it doesn't usually have.

I haven't tasted it, but I'm guessing it's starting to ferment. Anyone know if this would be safe to use? I'm guessing not, but I've not seen this before & wonder if anyone else has.