Text: I'm not sure whether the latter has any currency in America, but here in Australia it is often uttered in a pleasant--and perhaps patronizing tone of voice in instances such as, say, insisting to a reluctant teen-ager that he march off and do his homework.
Entailment: There is an Australian phrase that is helpful for telling a teen to go do his homework.
Contradiction: There is an Australian phrase that is unhelpful for telling a teen to go do his homework.