Over the past weekend, when insanely popular boy band One Direction took the stage in Montreal, Canada, audiences couldn't help but looking at Niall Horan's foot, as the singer was suddenly sporting a cast over it without any previous announcements or known accidents - and it seems he's not too sure at all how that happened!

Most people would remember how they got one of their limbs (or, really, any bone in their bodies) fractured, but not the 21 year-old star, as Niall Horan's foot breaking will remain a mystery for the time being - he didn't even know why it hurt until an X-Ray scan said he had broken it!

Hollywood Life reports that, to explain Niall Horan's foot fracture, the singer took to Twitter to post a video of himself being quizzed by bandmate Louis Tomlinson, who asks him to share a little about the story behind this new injury during a concert, most likely the one in Montreal were the fracture was made public.

Niall talking about his fracture #OTRAMontreal pic.twitter.com/ugf6Xj409e

— OTRA Tour Updates (@1DupdateOTRA) September 6, 2015

"I woke up before the show the other day and I had a pain in my foot," said the singer in the video posted on social media, explaining Niall Horan's foot injury. "Then I went to get an X-ray today and I've got a fractured right foot and I don't know how."

According to The Daily Mail, Niall Horan's foot became the subject of headlines after last Saturday, just as he was making great progress recovering from a knee surgery he went through in January 2014.

Still, The Mirror reports that the singer has actually reduced his risk of injury since the surgery, confessing a few months ago that he was "quite boring and probably the worst pop star that ever walked the planet."

In any case, hopefully Niall Horan's foot will heal soon and he'll be fully recovered from his injuries!