Professional group (12 - 13 people) who were in college together, graduated, set up their own practices etc meeting up once a year to catch up etc. One guy in the group each year would break down the bill into how much each person owed to add to the pot (not itemsied but divided by the number of people present). BIG foodies, plenty of expensive wines, after dinner drinks etc. He admitted after 12 years of their annual get together that he NEVER included himself in the bill... ever.