Professor Dumbledore:Certainly,certainly. Let me draw you up a chair.
Professor Trelwaney:I dare not,Headmaster!If I join the table, we shall be thirteen!Nothing could be more unlucky! Never forget that when thirteen dine together,the first to rise will be the first to die!
Professor McGonagoll:We'll risk it,Sibyll.Do sit down,the turkeys getting stone cold.
~Harry Potter and the Prisoner of Azkaban,page 228 chapter 11~