 You guess the ultimate Christmas movie according to science? Spoiler alert, it's not Die Hard. A UK study looked at four key factors. Number of Christmas references, box office, critical acclaim, and festive buzz. Whatever that is. The top five are the Santa Claus, How the Grinch Till Christmas, Love Actually, and Elf. And the number one spot goes to Home Alone. But no matter which is your fave, holiday movies are proven to offer a steady, risk-free supply of dopamine during a time of the year that can feel anything but merry. So treat yourself.