So, fans at the On The Road Again O2 Arena concert actually got a little gift with that tech glitch, the lucky buggers.
Watch the whole thing unfold in the video below - they had to restart several times, even getting the crowd in on singing with the guys. Niall Horan explained, "We've literally done shows all over the world and this has never happened once."
Oh yeah, and look for Harry Styles totally messing up a knock knock joke, but being totally charming about the whole thing. Because Harry.
Harry's reaction to the technical difficulty (24/9/15) -E https://t.co/OgSRB1y87l— 1D Updates (@The1DHotSeat) September 25, 2015
Even though they clearly haven't rehearsed it that much INFINITY SOUNDS SO GOOD LIVE -E pic.twitter.com/7Xv4949FFj— 1D Updates (@The1DHotSeat) September 24, 2015