John Krasinski played some pretty fantastic pranks as Jim Halpert on The Office. But putting Dwight Schrute’s stapler into Jell-O is child’s play compared to the ongoing prank war brewing between Jimmy Kimmel and Krasinski and his wife, Emily Blunt. Blunt appeared on Jimmy Kimmel Live last night, where she revealed she and her husband’s biggest prank yet.

It all began around Christmas three years ago with an innocent little break-in to Kimmel’s house, and escalated into something of a holiday mischief tradition—an arms race fought with a 26-foot tall inflatable reindeer and non-inflatable reindeer poop.

But things didn’t get serious until last year, when Kimmel decided to end it once and for all by transforming the outside of their house into a gift-wrapped winter wonderland—fake snow, giant marching men, carolers and all. Blunt and Krasinski kicked off this season with a bang by wrapping Kimmel’s car parked in his work lot.

We won’t spoil the two epic pranks Blunt and Krasinski pulled next—they’re better seen than described—but it involves more wrapping paper, an actual reindeer, a big-bellied Santa suit and stealing Kimmel’s clarinet. We’re already looking forward to seeing Kimmel’s retaliation in winter 2015.