Not so much a ritual...
...but as I grew up I kept finding out that everyday phrases my family used were (a) completely alien to most other people and (b) pinched from other languages rather than our own invention. Every evening the family would be gathered to the kitchen table in rapid order by somebody bellowing "ATTABLA!!!" (which lost something when I met the French phrase "à table"), my father would wish everybody "guten appetit" before we all tucked in, and any recalcitrance would be met with the exhortation "come on, it's lekker!"
(Vice Admiral Sir Charles Cockbrush KCB MBE DSO, who is finding it increasingly difficult to log into b3ta.com wants to duck your aunt and kick your puppy, Fri 21 Nov 2008, 9:26, Reply)