When our nan asks us 'what's so great about these One Direction fellows then?' we struggle to stick to a reply that lasts under ten minutes.

In fact, she fell asleep halfway through our explanation last time - we didn't even get to tell her about why we nicknamed Louis the Sassquatch.

One Direction premiere Take Me Home World Tour at the O2 Arena in Greenwich - PICS

Well Scapers, we no longer have that problem - because next time she asks we'll just show her this video of Liam whacking Harry straight in the nuts while onstage for their Take Me Home Tour.

It sort of sums up the 'essence' of One Direction, no?

liam payne hits harry styles in balls

Yup, one brilliant audience member managed to catch the glorious moment on film - from Payno's casual microphone flick, to Harreh bending double in pain.

We shouldn't laugh - but we will. Watch for yourselves below.

Naughty Paynis.

Inside One Direction's Take Me Home tour at London's O2 - PICS

One Direction's Take Me Home tour - a review 

Images: WENN/YouTube