Kit Harington explained the prank and shared a video of Rose Leslie's reaction, on 'The Jonathan Ross Show'.
On the show, Kit prefaced the video by sharing that his family likes to take part in different pranks for April Fools.
Meanwhile, Rose's family does not participate in any April Fools' pranks, whatsoever.
Setting up the scene:
The first shot of the video shows Rose Leslie innocently opening up the fridge, taking out a Brita water filter. But, unbeknownst to her, Rose finds something scary looking right at her on the fridge shelf. She stares at it, screams, and runs away from the fridge.
The best part is that she is still holding the Brita! That's some mad skill right there. Anybody else would've completely dropped the Brita filter.
After setting the Brita down on the counter, she moves to the floor, crying, and consoling herself about what she just saw. Then Kit reappeared to let her know it was just a prank.
What was she running from?
Kit had placed a scratched up head of a man on the top shelf of the fridge, right next to the fruit. Ironically enough, the head of the man looked a bit similar to Kit, himself. The lifeless eyes actually look like they're staring into your soul, so it makes sense as to why Rose reacted in such a dramatic manner.
I think it's safe to say, Kit learned that his fiancé doesn't appreciate pranks or any scary surprises.