http://www.stuff.co.nz/technology/digital-living/6522079/Telecom-customer-billed-2000-for-70Mb-of-data
This guy used 70mb of data in the cook islands @ $30/MB . So he was billed $2000 for checking face book.
Surely it has been widely enough publicised that you should avoid data roaming while overseas? He says telecom failed duty of care.
Not too much sympathy from me. Still amazing that they charge so much for mobile data though.