There's a town in Sweden, called Flogsta.
They have a very odd, but (in my opinion) really cool tradition. And maybe it's even healthy too!
Because every night at 10 PM students who live in the town start screaming.
According to wikipedia, no one really knows how it started:
There is controversy over how the tradition started. Some locals say it was simply a stress reliever, which started during exam times and then became a daily occurrence. Others say it started in remembrance of a student who committed suicide in the 1970s
I want this in my town too! Seems like a great stress reliever and just.. fun to do.