As well as revealing his sweet proposal to Rose Leslie on The Jonathan Ross Show, Kit Harington revealed that he once pulled this rather intense prank on his fiancé.
Harington said that in his family April Fools' Day pranks are a common thing, and he didn't realise until Rose's reaction that she was not used to them.
And this is how she reacted to his prank.
Here's a quick reminder of how she reacted.
When asked more about what Leslie's reaction was, he responded with this comment.
You know nothing, Kit Harington.