The Santa Clause (1994)

Divorced toy company executive Scott Calvin is pleased to have his son Charlie for Christmas, though the boy himself isn't happy about it. But when Santa Claus accidentally topples off the roof of the house and falls with a thud in the snow, Scott finds himself taking the merry old elf's place and earning new respect in his son's eyes. When the night ends, the reindeer take them to the north pole, and Scott discovers that by donning the fabled red suit, he's inadvertently agreed to become the next Santa Claus. The next morning he wakes up in his own bed and thinks it's all a dream--only Charlie remembers it with crystal clarity. Scott now has to deal with his suspicious ex-wife and her psychiatrist boyfriend, who both think he's playing tricks with Charlie's mind.
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