This TV-show name is "Tensai Takeshi no Genki ga deru Terebi" (TV taking heart with Genius Takeshi, known as Genki TV). TV host is Takeshi Kitano.
This clip is called 'Troop of One Hundred', where a 100 people chase after random strangers and you see their reactions. Totally harmless but their reactions are priceless.
For a translation of what they're shouting (thanks Digg):
- For the 1st and 2nd guys, they shout: "Here come the tsunami!!" (tsunami da!)
- For the 3rd guy they shout: "it's ...
