is 13 a lucky number in your country, TD? In most countries it counts as an unlucky one.
Reason: 1 messiah + 12 apostles = 13 of which one was a traitor, hence a dinner or meeting with 13 people at a table is considered to be potentially fatal; see also: Agatha Christie: 13 At Dinner [aka: Lord Edgeware Dies]
Indeed, in Christian mythology the number 13 has become one of ill omen But then, Christianity is a new-fangled thing anyway...
13 being unlucky goes back much further than that. In fact, the Code of Hammurabi has law #12 followed by law #14. Apparently it's been considered unlucky since long before the Last Supper.