Monsters Inc. is one of those movies that could never be topped by the sequel.
A lot of animated films from that particular early 2000s era will always have a special place in our hearts.
But some of the more subtle features in those Disney Pixar films often don't come to surface until much later.
In recent years, keen-eyed viewers of films like Toy Story and The Incredibles have uncovered subtle 'easter eggs', which are gentle nods to other flicks from the same studio.
And the latest has been discovered in Monster's Inc.
When Mike and Sully first meet the toddler who leads them on their wild adventure, they name her 'Boo' - one of the only things she can say to them.
But obviously Boo isn't her real name, and most people haven't realised that her actual name is there to be seen in the film.
In one scene Boo sorts through her drawings and right there at the top of the page is the name Mary!
It's thought the character is named after Mary Gibbs, the young actress who voiced her.
It was right there the whole time, and we're 20 years late figuring it out!
