Ant and Dec play prank on One Direction

One Direction called an ambulance to a fainting "fan" - then found out they'd been pranked by Ant and Dec.

The 'Little Things' hitmakers "panicked" after a man they were told was their biggest fan in New Zealand hyperventilated and suffered an asthma attack, so called in emergency services, before the 'Saturday Night Takeaway' hosts revealed their true identities.