Today's South Island snowfall has uncovered a strange phenomenon.
Stuff called for reader pictures of the winter wonderland. We always do. But this time, for some unexplained reason, it has led to a flurry of pictures of Mainlanders frolicking in the snow in their underwear.
The photos have ranged from men striking poses to girls covering up with artistically-placed frying pans.
Lakya the husky has an early morning romp in the snow in Ashburton.
Snow in Wigram, Christchurch.
WHITE OUT: Snow lies thickly on a garden in the hills above Rangiora.
Snow in Woodham Drive, Ashburton.
SHIVERING: No escape for these animals in a paddock near Rangiora.
SHELTER: Some stock have found shelter from the wind and snow.
WINTRY: Rangiora residents woke to see their gardens blanketed in snow.
SLIPPERY: Careful progress for traffic on Dyers Pass Rd.
ASHBURTON: Snow has been falling heavily in mid-Canterbury.
SNOWGLOBE: Ashburton resident Christine Richards has photographed the large flakes as they fall.
SNOW LOVER: Eli of Ilam loves snow, says the Dowsett family.
PREBBLETON: Winter landscape
PRETTY IN PINK: Flowers still blooming in Ilam.
NEVER TOO EARLY: Jazmine was out playing in the Twizel snow before daylight.
PLAY TIME: Summer Bennett rugged up in Rolleston.
Snow falls in Westmorland, Christchurch.
Snow in Burnside, Christchurch.
A house surrounded by floodwaters north of Greymouth.
Police closed SH6 north of Greymouth to most traffic after McLeans Creek overflowed.
Flooding on State Highway 6 north of Greymouth.
Wintry conditions at Christchurch Airport.
SNOWED IN: Sam Marsh and his dog Chai catch snowballs in Springfield, where around 20 centimetres of snow has fallen.
PRETTY AS A PICTURE: Snow along the Avon River.
WHITE OUT: Windsor Drive, Kirwee gets a good covering of snow.
COOL FRIEND: Natalya, 8, and Felicity, 7, with their snowman in Rolleston.
SNOWY DAY: Larnach St in North Beach.
SNOW TIME: 15-month-old Isaac tries to catch snow in Redwood.
ALL WHITE: AMI Stadium covered in snow.
BUMPY RIDE: Joseph Austin does a bit of snow biking in Rolleston this morning.
SNOW ANGELS: The Cathedral of the Blessed Sacrament.
PEACE AVE: Fairlie's main street gets a dusting of snow.
TOO HIGH: Courtney O'Neill, 4, tries to dust snow off a mailbox in Fairlie.
FUN AND GAMES: Joe and Nick Brien play in the snow at Fairlie.
ICY ANTICS: Greta Pudney, Teniesha Holden and Eliza Pudney play in the snow at Fairlie.
NEW LOOK: Snow in Fairlie.
SNOW MEANS FUN: A drift triker plays in the snow in Major Aitken Drive, Huntsbury.
SNOW DAY: Drift trikers in the snow in Major Aitken Drive, Huntsbury.
COOL IDEA: Drift trikers in the snow in Major Aitken Drive, Huntsbury.
Hanmer Springs received a significant blanketing of snow with 20 centimetres having fallen by Wednesday afternoon. Local girls Kelly Rutherford, Zoey Cuff and Jazmine Cuff enjoy a warm dip at the Hanmer Springs Thermal Pools before the pools closed for the day due to a power outage.
MACHO MAN: Max Wilkins braves the snow in Burwood.
WARM IN HERE: A boy plays in an igloo in Oxford.
GOOD DUSTING: The Christ Church Cathedral.
WHAT SNOW?: For these Canterbury University students, winter still hasn't arrived.
MAKING TRACKS: A snow plough clears the road in Hanmer Springs.
Rudi Cepon braves the snow. He is visiting Christchurch from Brisbane.
NEW BUDDY: Cassidy Earnshaw, 4, plays in the snow at her Ohoka home.
WHAT IS THIS?: Sienna Tobeck, 19 months, isn't keen on walking in the snow to Tumara Park.
ICE QUEENS: Today's snow gives these students a chance to show off their modelling skills.
LOTS OF FUN: Sophie and Mark Shawe enjoy the snow in Waimairi Beach.
FAMILY FUN: Dr Annie Maillard and Esme Maillard enjoy a snowfight at TaiTapu.
SNOWED IN: Kylee Simpson sent in this photo from Lake Coleridge Station, where she is home with a new baby.
FUN IN THE SNOW: Nick and Claire Goodey at Sumner Beach.
WATER'S EDGE: Snow reaches the sea at Southshore beach.
WARM KITTY: Mia the cat is wrapped up warm against the cold by her owner Chris Hlavac.
SURF'S UP: Southshore beach was transformed by snow today.
GETTING CREATIVE: Maya Stiven makes snowmen in her Beckenham backyard today.
DOG'S LIFE: Gemma the bichon in her Rangiora backyard.
BIRD FEED: A finch feeds in Eric Pollock's Rangiora backyard.
But why? Has the polar blast frozen some of their inhibitions? Are those in the South simply more comfortable in their own skin?
And why just the South? The lower North Island was hit hard by a rare snow dump last year yet Stuff's typical call for reader pictures didn't generate anything like this near-nude response.
Is it something in the water down there? Are the Southern Men and Women just made of tougher stuff?
We'll add to our gallery as we await your answers...