Any big One Direction performance is likely to cause a meltdown with their fans.
So it's hardly a surprise Directioners got incredibly excited when their idols performed on the X Factor live final on Sunday night.
The boyband took to the stage at London's Wembley Arena to sing their song Midnight Memories.
And the sound of their beautiful voices and the sight of them leaping around the giant stage proved to be too exciting for some devotees.
After seeing the band perform, one fan wrote: "This time three years ago One Direction had just left the X Factor competition and now they're performing and the biggest band. I'm unstable."
Another ecstatic fan tweeted: "I just watched One Direction on the X Factor. Oh my gosh they are carved by angels????"
In fact, some One Direction fans were left so stunned by their love for the band's performance they completely lost track of the whole point of the X Factor - to find a new pop legend - and demanded the rest of the show be handed over to Harry Styles, Liam Payne, Zayn Malik, Louis Tomlinson and Niall Horan.
One person wrote: "Hey X Factor here's an idea. Quickly announce the winner and then let One Direction sing the rest of the album."
However, some fans had joined in the Twitter meltdown in a slightly different way and didn't seem overly impressed by their new look.
The band wore dark T-shirts and jeans and attempted to go for more of a rock look to go with the sound of their track Midnight Memories.
One Twitter user wrote: "When did One Direction turn into rugged punk rock men what happened to the bugglegum pop look?"
Another posted: "Why are One Direction trying to be a rock band? OMG?"
But the lads certainly seemed popular with the Wembley Arena audience who screamed the roof off as they performed.
Speaking about their plans for the new year, Niall told X Factor host Dermot O'Leary: "We'll be back on tour in April. We go back to South America and we happen to be playing Wembley Stadium."
And on their plans for Christmas Harry joked he was looking forward to the break, saying: "We're absolutely sick of each other."
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