The Chronicly Tardy Cousin

You and your cousin, despite sharing the same family, have never gotten along. This cousin has an infuriating habit of showing up hours late to family events, as if their own time is the only one that matters. Today, during yet another Christmas dinner, their lateness pushed you over the edge and you called them out in front of everyone. In retaliation, your cousin, who refuses to see the problem, threw a tantrum, and the next thing you knew, you were both trapped in a room with a locked door and a sign that read 'Fix it or no one leaves!'.