doccarnby: I'm talking the time he smacked down Arias at the Council of Nicaea.
https://en.wikipedia.org/wiki/Saint_Nicholas#Life "In 325, he was one of many bishops to answer the request of Constantine and appear at the First Council of Nicaea. There, Nicholas was a staunch anti-Arian, defender of the Orthodox Christian position, and one of the bishops who signed the Nicene Creed. Tradition has it that he became so angry with the heretic Arius during the Council that he struck him in the face."
http://www.stnicholascenter.org/pages/bishop-nicholas-loses-his-cool/
http://www.stpeterslist.com/11939/when-santa-punched-a-heretic-in-the-face-13-memes-on-st-nicholas/
https://en.wikipedia.org/wiki/Arius#The_First_Council_of_Nicaea "According to some accounts in the hagiography of Nicholas of Myra, debate at the council became so heated that at one point, Nicholas struck Arius across the face. The majority of the bishops ultimately agreed upon a creed, known thereafter as the Nicene creed. It included the word homoousios, meaning "consubstantial", or "one in essence", which was incompatible with Arius' beliefs. On June 19, 325, council and emperor issued a circular to the churches in and around Alexandria: Arius and two of his unyielding partisans (Theonas and Secundus)[29] were deposed and exiled to Illyricum, while three other supporters—Theognis of Nicaea, Eusebius of Nicomedia and Maris of Chalcedon—affixed their signatures solely out of deference to the emperor. The following is part of the ruling made by the emperor denouncing Arius's teachings with fervor."
http://ocafs.oca.org/FeastSaintsLife.asp?FSID=103484 "In the year 325 St Nicholas was a participant in the First Ecumenical Council. This Council proclaimed the Nicean Symbol of Faith, and he stood up against the heretic Arius with the likes of Sts Sylvester the Bishop of Rome (January 2), Alexander of Alexandria (May 29), Spyridon of Trimythontos (December 12) and other Fathers of the Council.
St Nicholas, fired with zeal for the Lord, assailed the heretic Arius with his words, and also struck him upon the face. For this reason, he was deprived of the emblems of his episcopal rank and placed under guard. But several of the holy Fathers had the same vision, seeing the Lord Himself and the Mother of God returning to him the Gospel and omophorion. The Fathers of the Council agreed that the audacity of the saint was pleasing to God, and restored the saint to the office of bishop."
http://catholicexchange.com/in-this-corner-st-nicholas/