During a quick workout session in the garage, Mitchell accidentally knocks over an urn filled with the ashes of Cam's beloved pet pig Lilly. He quickly attempts to cover up his blunder and devises an appropriate cover-up. Hoping to catch Mitchell in his lie, Cam makes up a tall tale to trap him, but his own lie soon becomes a little too big to manage.

Frank Dunphy's wedding has a Roaring '20s theme, so Phil gets his clan to show up in costume, but Claire and the kids realize it's time for an intervention with Phil when they're the only ones who dressed up. Meanwhile, Jay comes to regret mastering the art of saying "no"; and Cam finally gets the courage to stand up to his sister Pam.