Not the weight drop WW goers were looking for. Photo: Walgreens.com

Hopping on a scale? No fun.

Hopping on a scale at Weight Watchers? Really no fun.

Hopping on a scale at Weight Watchers and then having the floor collapse underneath you? No fun times infinity.

But that's just what happened at the Vaxjo, Sweden branch of Weight Watchers, where the floor collapsed as 20 dieters gathered for a weigh-in, the NY Post reports.

Luckily, nobody was reportedly injured, though a few egos were no doubt shattered.

"We suddenly heard a huge thud; we almost thought it was an earthquake and everything flew up in the air," a member told Sweden's Smålandsposten paper, via the paper.

"The floor collapsed in one corner of the room and along the walls."

Thankfully, the floor was only just above ground level, according to the source, though those on the scene reported smelling sewage after the collapse.

It's not clear what triggered the collapse, but we'll be jump-starting our new diets today, just in case.

Meanwhile, read why shopping helps women burn 47,700 calories a year.