Mario Balotelli kicked team-mate Andrea Poli for no reason at all during an intensive training session this week.
The cheeky jab in the back of Poli's knee was enough to wind up the midfielder, who looked both angry and baffled at Balotelli's antics, Metro.co.uk reported.
Balotelli didn't seem to mind he just drifted off away from the training field after dishing out the blow, leaving Poli nursing the knock.