Getting roasted while drowning in burning excrement and watching everything you love being quartered and flayed. While being pumped full of adrenaline to keep you from passing out.
Adrenaline would serve to numb or completely extinguish all pain -- for a period of time, especially in large amounts.
But really. This thread's both disgusting and depressing. So I think we shoul make one about the best way of being born.