Hatfields & McCoys? I don't think so. The biggest family feud is the Kimmels vs. the Blunt/Krasinskis. Jimmy Kimmel and his wife Molly live across the street from husband and wife John Krasinski and Emily Blunt, and they've been engaged in a years-long Christmas Prank War that shows no signs of slowing down.
This year, after the Kimmels gift-wrapped their neighbors' entire house, complete with snow and Christmas carolers, Blunt and Krasinski to one-up Kimmel in a big way.
For several days running, they've gift-wrapped Kimmel's car and filled it with an assortment of goodies. Day One was Christmas ornaments. Day Two was carolers (but thankfully, not reindeer poop. And Day Three was the big one. Krasinski showed up dressed as Santa, in possession of Kimmel's actual computer and clarinet. What happens next — well, you'll have to watch.