I rather like the idea of what the Vikings sometimes did: "The oath-swearing practice varied significantly, sometimes involving ritualised drinking or placing

I rather like the idea of what the Vikings sometimes did: "The oath-swearing practice varied significantly, sometimes involving ritualised drinking or placing hands on a holy pig (referred to as a sónargöltr) that could later be sacrificed" https://en.wikipedia.org/wiki/Heitstrenging https://en.wikipedia.org/wiki/Heitstrenging