When a player joins a new club they probably feel like the new kid at school.
Matteo Guendouzi seems to be settling into life at Arsenal since his move from Ligue 2 side Lorient in the summer and he has his own way of making friends.
The France-U21 international posted a video on his Instagram story playing a prank on his colleague Shkodran Mustafi.
The 19-year-old showed an Arsenal-branded water bottle to the camera and threw it into the ice bath that Mustafi was standing in.
The German defender got quite the shock as the freezing cold water splashed against his upper body.
The former Valencia centre-back yelled out as the water hit his skin and you can hear Guendouzi laughing in the background.
Unai Emery's squad will have to watch out for the new class clown in the future.
Mustafi was recovering from the Gunners' 4-2 victory over bitter rivals Tottenham on Sunday.
Unai Emery's side bounced back from a 2-1 half-time deficit as Pierre-Emerick Aubameyang, Alexandre Lacazette and Lucas Torreira all scored in the second half.
Arsenal leapfrogged Spurs into fourth thanks to their victory at the Emirates in the north London derby.