A pair of Michigan twins gave birth 15 minutes apart.

The respective husbands of twins Allison Oliverio and Amy Gilbert say that their wives do EVERYTHING together - apparently this includes giving birth! Twenty-five years after the pair had been born (only an hour apart), Amy and Allison birthed their children in adjacent hospital rooms in a quarter of that time! Oh, and in case you were wondering, Amy had a boy named Garrett and Allison had a girl named Claire.
(source)