Bet you didn’t notice this at the movies.

In Harry Potter and the Prisoner of Azkaban, there’s a very sneaky, blink-and-you’ll-miss-it sex scene between two students.

Fans of the series (aka everyone on earth) will know that in this film, Fred and George Weasley give Harry a Marauder’s Map, which allows him to see the exact location of everyone on the Hogwarts campus:

Now, in the credits of Prisoner of Azkaban, there’s footage of the map in action, with little footprints running across its surface. And if you look closely enough, you can see the footprints of two students TOTALLY GETTING IT ON:

Let’s take a more detailed look:

Totally busted.