My favourite opening:

Not everybody knows how I killed old Phillip Mathers, smashing his jaw in with my spade, but first it is better to speak of my friendship with John Divney because it was he who first knocked old Mathers down by giving him a great blow in the neck with a special bicycle-pump which he manufactured himself out of a hollow iron bar.

A close second:

The sweat wis lashing oafay Sick Boy; he wis trembling. Ah wis jist sitting thair, focusing oan the telly, tryin no tae notice the cunt. He wis bringing me doon.