(nested 6 deep reply below)
Very appropriate, we should cooperate and collaborate and write a prefect parenting book :) lol...
I could never get my 4 year old to do what I needed her to do.
So for three years I threatened her with burying her under the clothes-line next to her brother Joshua who I buried there due to his intractable willpower and lack of compliance.
This threat kept her very obedient from the age of four till she was seven, then it seems she realised she did not actually have a deceased naughty brother...