Actually, "blacking out" just means a complete lack of memory about what happened when the alcoholic comes out of it. Some people in blackouts behave in a normal way, have normal conversations, but no recollection later of what they said or did. So it doesn't have to be bizarre or scary behavior.
One thing, though, I've never seen/heard of blackouts being experienced by normal, non-alcoholic drinkers. Even if they get drunk and "pass out" they don't go around doing things that they don't remember.