Hong Kong Rugby Sevens: going wild in the South Stand – in pictures

Rock'n'roll: the highest achievement of the Egyptian civilisation Photograph: Bobby Yip/REUTERS

At almost every fancy-dress party in the world, someone will turn up in a morph suit Photograph: Bobby Yip/REUTERS

Following his defeat at the hands of Batman, Bane really let himself slide… Photograph: Antony Dickson/AFP/Getty Images

… Slash, meanwhile, is looking a lot better Photograph: Cameron Spencer/Getty Images

Where's Wally loses its appeal when there's 17 of them… Photograph: Laurent Fievet/AFP/Getty Images

'Yeah, I was thinking of going as a monkey in drag, with a green feather boa and wig'. But of course Photograph: Cameron Spencer/Getty Images

Isn't that the beer equivalent of cannibalism? Photograph: Mark Kolbe/Getty Images

The beer bong, that staple of American college parties, is given a new lease of life on the terraces Photograph: Mark Kolbe/Getty Images

That other great American import, the 'shaka' handsign. Best accompanied by incredibly loud whooping Photograph: Cameron Spencer/Getty Images

Fans must get unruly if they've roped in Cobra Kai on security Photograph: Antony Dickson/AFP/Getty Images

He's probably not weeping for the state of humanity Photograph: Vincent Yu/AP

Costumes with ease of access to mouth are usually a priority Photograph: Mark Kolbe/Getty Images

This moment of calm and serenity probably didn't last Photograph: Cameron Spencer/Getty Images