Emily Blunt stopped by "Jimmy Kimmel Live" on Monday, where she revealed this year's prank between her hubby John Krasinski and Jimmy.
Blunt and Kransinski live right next door to the late night host, and the group of friends have had one hilarious ongoing prank war for the last few years.
Every year around the holidays, Kimmel, Blunt and Kransinski try to one up each other with the best holiday-themed prank.
Last year, Jimmy had the "Office" alum and the "Into the Woods" star's house covered head-to-toe in wrapping paper ... and the year before, he dropped off a giant inflatable reindeer and "reindeer poop" on their front lawn. But, we think the actors might have taken the win this time.
Check out the video above to see John and Emily's hilarious (and expensive) prank!
After John seemingly totaled Kimmel's car outside of the studio, Blunt told the late night host that she's worried there's no end to their neighborly rivalry.
"I don't know where we stop. I don't know how we put an end to this," Blunt told Kimmel after watching John crash his car. "We're going to keep doing this until we are dead."
Well, as long as the battle's in good fun, we hope they continue this holiday tradition -- what do you think about Emily and John's prank? Tell toofab in the comment section below!