You can find it around the 23 second mark, where Belle asks, "Have you lost something again?"
And Monsieur Jean replies, "I believe I have. Problem is I can't remember what!"
Ringing any bells yet?
An almost word-for-word exchange happened in Harry Potter and the Philosopher's Stone, when Hermione asks Neville Longbottom about his Remembrall which he received in the post.
Neville replies, "The only problem is, I can't remember what I've forgotten."
A very sneaky reference, but one Harry Potter fans have picked up on nonetheless!
Fans posted on Twitter to celebrate finding the reference.
This film will hit cinemas on March 17, 2017.
Article first appeared on marie claire.