An endless, perpetual playground, albeit a dreary, small-town Pennsylvania one, is the perfect place to explore these concepts, an intellectual exercise of the greatest significance; for Heidegger, the question of eternal recurrence was the “most burdensome thought”, perhaps the “thought of thoughts”. And yet, Harold Ramis’ Groundhog Day, which turns 25 this month, never struggles under the weight of this philosophical heft, nor does it particularly regard it – it’s almost happenstance.I celebrate by putting on Thank Christ for the Bomb. Today Tony McPhee is 73.