By the way, I have nothing against threatening per se.
The threat has to be immediate, though. "Do that again and I'll rip your arms off and feed them to you" kind of thing, not "you won't be able to go to the drive-in with your cousins next week."
The former is the threat of a person in control. The latter is the threat of a lazy weakling who will live to regret her words if she should remember them, which she won't.
I once had to apologize to my neighbor when I realized that she could hear me saying stuff like the former.
One day I heard her pull into her driveway with her kids. It was pretty late and I was aware of the amazingly silent way they shut their car doors, and the low voices with which they said the kinds of things you say to each other as you are going into the house.
Suddenly I became conscious -- with that acute consciousness that only comes with a shifting point of view -- of just how noisy we all were.
I only hadn't known because she was so quiet and never said anything to her kids above a whisper in her air conditioned house...while our windows were wide open with me yelling juicy stuff at the top of my lungs...
I had to tell her that if she heard me saying anything like "One more word out of you and I'll knock you into next week" (a favorite saying passed down from my grandmother), she wasn't to think that any violence was actually transpiring.
"Oh, no," she lied. "We never hear anything!"
Now you can understand why I had to move to a house in the country.
Are we all clear? Adapt according to your style and the child's age. Try to use your common sense.