Home Alone is a classic Christmas film and is rewatched by millions every December, with it becoming a staple to the festive TV guide.
The original iconic movie, which was released 33 years ago, stars Macaulay Culkin as Kevin McCallister, who is left behind when his family head off to Paris for Christmas.
Kevin's cousin Heather does a headcount before they leave, but she accidentally includes a neighbour, mistaking him for Kevin.
It's long been wondered how Kevin's family failed to realise they'd left him behind, but now fans have uncovered how the mistake happened - and it really was an accident.
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