Terminator 2: Judgment Day (1991)
Boom mic visible
However, in its final confrontation with Sarah Connor, the T-1000 acts exactly the way a human would: he waves its finger and shakes its head in a slow, sadistic manner. (Not out of necessity to blend in etc., they were alone in that scene)
Although this could be interpreted as artistic / creative liberty for that particular scene, it's still out of character for a machine to display this type of human behavior.