Over the weekend, someone flipped open his Canadian passport under a UV black light and uncovered that the Canadian government had hidden a PARTY in its pages.

The “secret” UV images are cleverly incorporated into the parts of each page that are visible under normal lighting so that the two complement each other when seen under UV light. These images, along with a biometric chip in the back of the passport, are all security measures designed to ensure that duplicating or forging a passport would be as difficult and complicated as possible.

They posted their discoveries to Imgur: Here’s what the old passports look like under normal light.

BONUS: Animated Finnish Pasport