I was minding my own business when I found an NPC village in my new 1.6 Survival SP world...
I walked into a villagers house and started trading with him.
HE
MADE
A
SOUND.
They didn't tell us so we'd be freaked out.
It worked on me... ;_:
They go "Hmm..." And "Huh."
It's terrifying.
Seriously.
Next thing we know they gain sentience and don't tell us... And then they turn on us...