1D's Liam, Louis 'Used To Be At Each Other's Throats'
Boyband reveal past tensions in This Is Us DVD extra clip...
Louis explained: "We used to be at each other's throats on The X Factor."
Payne went on to add: "There was one point where I literally wanted to whack him."
Liam also addressed his title of being the "daddy" of 1D, with Zayn Malik joking that they have began to "corrupt" him.
1D are due to release This Is Us on DVD on December 19 - just in time for Christmas.