I was at a wedding about 20 years ago and it all kicked off at the speeches.
The Best man,( The Grooms Brother), announced,"Lifes a Bitch and then you marry one"
Later on the Groom hinted at some previous animousity between the clans and said, "I realise we have not always seen eye to eye", at that, the respecive mothers stood up and moved their chairs away from the respective fathers.
Until the dancing started, the atmosphere was Baltic.