` `` Vegas Vacation celebrates its 25th anniversary this year . The movie was the 25th in the National Lampoon ` `` Vacation '' . It was written by Beverly D'Angelo based on one of his short stories .
`` Christmas Vacation '' celebrates its 25th anniversary this year . The movie was the third in the National Lampoon `` Vacation '' series . It was written by John Hughes based on one of his short stories .