If there is one thing in football any fan is not allowed to do, it is changing the team you support.
And swapping from Arsenal to Spurs or vice versa is one of the biggest crimes in the sport.
However, the fans in the above video had no choice but to switch their allegiances - because they were hypnotised!
In a video made by Green Flag, a hypnotist convinced a group of Arsenal and Spurs supporters to change the club they support.
And he did it during the north London derby!