This Is A Time Machine

'I am dying, in a few seconds they will find my corpse splattered on the pavement, the Santa clause suit soaked in my blood and a dumb look on my face. I am dying; if the revolver pointing at my head fails then the fall will do the trick-- so I guess I've got options haha. I am dying, and all I can see is a little boy waving a finger at me, disappointed, pouting, wishing he never had to grow up to become me. I am dying and... holy shit, I am dying. I am dying.'

In his final moments, a homeless New Yorker finds himself catapulted back in time, landing back in his childhood where he tries altering his past to prevent his imminent demise.