Bursaspor goalkeeper Harun Tekin is clearly not a man to be trifled with, if this video clip is anything to judge by.
Tekin was keeping goal for his side in a 2-0 defeat to Kasimpasa and conceded the second goal deep into injury-time in the game.
One supporter became so excited by the result that he decided to encroach onto the pitch, much to the disgust of Tekin, who decided to take matters into his own hands.
Tekin, who was making only his fourth appearance for Bursaspor since joining in July 2010, took at least eight swings at the intruder before appearing to continue in his role concentrating on the match, as officials removed the supporter.
However, the Bursaspor goalkeeper was not satisfied with his original punishment of the encroacher and swiftly returned to mete out further punishment to the fan, who was being hauled away by security staff.
It may not rank alongside Eric Cantona's infamous kung fu kick aimed at a Crystal Palace supporter while he was playing for Manchester United in 1995, but it's still a painful lesson to be heeded for any would-be pitch invaders.
Tekin threw his shirt away in disgust as he left the field, but we can safely assume the supporter in question will not be entering the field of play again in a hurry.
Tekin's attack wasn't the only video to make us go "ouch!" today.
Austrian side SC Weiz had clearly been working on a new approach to free kicks and placed two of their men kneeling in front of the wall against FC Furstenfeldbruck.
But Kevin Steiner's set piece was not exactly perfect in its delivery, as you will see in this YouTube clip.