|Small child looks on at Santa in with the sharks|
You've all heard or maybe even said something similar to: "now be good - or else Santa won't bring you any presents."
Or even worse the child is threatened with the possibility of being 'black-balled' and ending up on Santa's "Naughty List".
I would imagine these threats probably work very well in subduing the little ones, but if all that fails, take the child to a mock (your choice) Santa execution like the one above.
They'll soon get the picture.