I didn't get this at first...
One day Kerry celebrated her birthday. Two days later her older twin brother, Terry, celebrated his birthday. How come?
At the time she went into labor, the mother of the twins was travelling by boat. The older twin, Terry, was born first early on March 1st. The boat then crossed the International Date line (or any time zone line) and Kerry, the younger twin, was born on February the 28th. In a leap year the younger twin celebrates her birthday two days before her older brother.
This was on the website so I guess I have to acknowledge this: "This puzzle was submitted to Games Magazine's 'How Come' competition in 1992 by Judy Dean. It won."
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