From the 2007 Hoggetown Medieval Faire in Gainesville, FL.
And just for the record, "vikings" most likely never had horns on their helmets. Think about it - if you are in close combat (with swords and axes) do you want to have these horns sticking out above you so your enemy can grab them and pull your head down to kill you? Didn't think so.
No archaeological evidence has ever been found of a "viking" horned warrior helmet. Its just one of those modern stereotypes that developed with no basis in fact.
Still... I do enjoy Hagar the Horrible comics. :)