It is disputed whether he slapped him on the mouth, fed him a knuckle-sandwich, or boxed him on the ear, but one thing seems clear: Santa Claus most likely hit the heretic, Arius of Alexandria, during the Ecumenical Council of Nicaea in 325 A.D.
-- from the thread Is Man to Become God? [St. Athanasius]
Semi-related threads:
German Catholics want Santa-free Christmas [organisation calling for 'Santa Claus-free zones']
Look out, Santa! Chocolate-wielding Germans target Xmas hero
The Crisis of Christmas
Who Was Against Christmas?
St. Nicolas visits Schuylerville
The "Claus" Clause
And then there's these:
Santa Claus Slams Obama and McCain: Announces Candidacy for President
CIA sense of humour classified in the plot against Santa Claus
FReeper Million Santa March saves the day for Kensington Town, Montgomery County, Maryland!
The REAL St. Nick did not look so nice after all. He didnt like heretics.