Attention, world: Niall Horan just sang Taylor Swift's 'Out of the Woods' and WE CANNOT HANDLE IT.

While meeting and greeting fans at a One Direction signing in London this week, Niall burst into the Harry Styles-inspired track -- and one incredibly lucky fan Vined it for the fandom's viewing pleasure. We salute you, lucky Directioner.

Though we're not yet sure what caused Niall to start singing our fave track off of '1989,' we're gonna go ahead and assume that he was just trying to give his bandmate a rough time. Or maybe a fan requested it. Or maybe he's just a huge Taylor Swift fan and 'OOTW' is his biggest '1989' obsession, too. Whatever it was that prompted him to sing it, we haven't stopped freaking out.

While neither Taylor (nor Harry) ever publicly confirmed that 'Out of the Woods' was about the boy bander, the song is filled with lyrics that allude to the couple's romance. "Your necklace hanging from my neck” and “two paper airplanes flying,” most likely refer to their matching paper airplane necklaces, while “remember when you hit the breaks too soon / twenty stitches in a hospital room," illustrates the moment the two got into a snowmobile accident. And Taylor herself explained how the track that detailed a relationship where the timing was hard, revealing: “Every day was a struggle. Forget making plans for life — we were just trying to make it to next week."

Listen to Niall sing 'Out of the Woods' in the video above.

See How the Guys of Taylor Swift's Music Reacted to Songs About Themselves