When playing a game of dominos, or when such a thing is being considered, every opportunity should be taken to make one of the following announcements.
Cornell's postulate : The double seven never scores
The Cornell refutation : "The double seven never scores" should be said very loudly whenever it does
The Groves' threshold : The time at night at which it is too late to start a game of doms
The Groves' limitation : Only normal threes and fives should be played
Hall's Allegation : Anybody after Syd never scores
Black's Quandary : Which of the two 11|3s should I play?
BM's Proposal : Before the next hand should we get the next round in?
He's Morrising : This announcement should be made when somebody reaches the high 90's but then fails to score, with the risk - and hope of the rest of the players - that somebody else will either catch up, or overtake and win.
In addition to the above mentioned Doms based announcements, additional ritual statements subsist. These include:
Whenever (or at least the first time of an evening) that a pint of Charles Wells' excellent Bombardier is ordered, all present (well, all who feel like it) shall intone in a Tolkieneske fashion "Ho Tom Bombardier, Tom Bombadildo", and repeat until threatened with violence (ie, not repeat very much at all).
It is important to explain what a pint of Tribute isn't