Benfica defender Luisão (wearing number four in black) punched or shoved or hit referee Christian Fischer during a match between Fortuna Dusseldorf and Benfica which resulted in the match being abandoned. Sure, the officials should never be physically battered, or assaulted for that matter, but this is pretty funny, made all the more ridiculous because it happened during a friendly.
The angles are tough, but it does not look like Luisão made flush contact with his fist, but there is no doubt that he struck Fischer. Fischer then flies through the air and lands on his back and "was in a daze for a few minutes, before abandoning the match after 43 minutes and leaving the field for treatment by Dusseldorf's team doctor." [Soccernet]