Riddle: Peter celebrated his birthday on one day, and two days later his older twin brother, Paul, celebrated his birthday.
How could this be?
Answer: When the mother of the twins went into labor, she was travelling by boat. The older twin, Paul, was born first, barely on March 1st. The boat then crossed a time zone, and the younger twin was born on February the 28th. In a leap year the younger twin celebrates his birthday two days before his older brother.