Au Pair (1999)

A fresh MBA graduate shows up for what he thinks is a finance job interview, only to discover he's been mistaken for an Au Pair candidate. To his shock, he's hired on the spot to look after two obnoxiously spoiled children from a wealthy family. What follows is a hilarious clash of corporate ambition and chaotic childcare, as he struggles to survive tantrums, pranks, and his own complete lack of parenting skills.