Every time J.K. Rowling posts something substantial on Pottermore its like the second coming of Jesus. We all come back and unite and prove that we’re stronger than ever. We’re like an army
WE ARE THE HARRY POTTER ARMY!
So, I have this headcanon that on Fred and George’s first day of Hogwarts, when Fred was called for sorting, George went up instead, and the hat realised, and told him off. George ran back to Fred sniggering, and the kids found it hilarious, and the teachers just rolled their eyes/facepalmed at what they’d have to put up with for the next 7 years.