someone i know once dated a girl who practised a particularly virulent form of one-upmanship.
say your grandfather had just died of a heart attack, hers would have been mauled to death by a pack of rabid poodles lately escaped from a circus.
if you mentioned in passing that you had ridden a horse at summer camp, she would regale you with tales of how once, in north africa, having been kidnapped by a group of touaregs, she had ridden across the dessert bareback on an angry camel, naked, to make her escape.
heaven forbid your friend had just had a baby, hers had just given birth to a two-headed calf, following an alien abduction and sick trans-species breeding experiments.
it's a good thing it didn't last.