http://www.youtube.com/watch?v=pfW95sSaVVo
This took place in a swedish university during a lecture about religion and freedom of speech. The video that Lars Vilks showed during this clip was made by an iranian artist. Before this he had showed examples of offensive material directed at christianity etc.
And there is a funny kind of double standard involved, because practically nobody objects when artists offend religions where the response to the alleged offence isn't violent.
EDIT: A few days after this attack, "somebody" tried to firebomb Vilk's house. All because of a series of rather tame drawings like this one:
http://en.wikipedia.org/wiki/File:Muh-hund-original-rondelll...