There's no "spring break" in norway, but we do have the time period between 1st of may to 17th of may where the Sr. high students ( except we don't divide school thingies into the same years as in the US so it's actually one or two years above that) are basically on a 17 day long bingedrinking/party session in something we call "russefeiring" (it has nothing to do with russia).

It varies from person to person, but often time, you'll have groups of students pooling their money to buy an old van that they fill with speaker systems and drive around shooting at people with water guns while drinking beer. Some of the wealthier students sometimes even buy a whole smurfing bus to party in.

Pictures related:
http://www.xelent.no/images/produktb...wxyutlo1kc.jpg
http://www.graffiti.no/russebuss/odyssey.jpg