Practical joke of the day

Requirements:

1 x Phone
1 x Female (younger the better)
1 x Male
No sense of decency

Plan:

The female should ring ChildLine on 0800 1111. When the phone is answered, she should start screaming as though in distress. Continue this for half a minute and then the male should shout angrily, before hanging up.

When ChildLine ring back, the male should answer, saying that everything is completely fine. At some point, the female should start screaming again. Then hang up and don't answer again. Probably best if you do this from a public phone..

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Incidentally, when researching this, I noticed that ChildLine have a textphone number - how many abused children have access to a textphone?